diff --git a/scripts b/scripts
index f56426fa..e791ced0 160000
--- a/scripts
+++ b/scripts
@@ -1 +1 @@
-Subproject commit f56426fada59012329f23c928a2d7f9c3a515d75
+Subproject commit e791ced0395245e30d37b5098a27bba5e818ecb7
diff --git a/yesod-core/Yesod/Config.hs b/yesod-core/Yesod/Config.hs
new file mode 100644
index 00000000..51216e59
--- /dev/null
+++ b/yesod-core/Yesod/Config.hs
@@ -0,0 +1,182 @@
+module Yesod.Config
+    ( AppConfig(..)
+    , PostgresConf(..)
+    , SqliteConf(..)
+    , MongoConf(..)
+    , loadConfig
+    , loadPostgresql
+    , loadSqlite
+    , loadMongo
+    ) where
+
+import Control.Monad (join, forM)
+import Data.Maybe (fromMaybe)
+import Data.Object
+import Data.Object.Yaml
+
+import Data.Text (Text)
+import qualified Data.Text as T
+
+-- | Dynamic per-environment configuration which can be loaded at
+--   run-time negating the need to recompile between environments.
+data AppConfig e = AppConfig
+    { appEnv  :: e
+    , appPort :: Int
+    , appRoot :: Text
+    } deriving (Show)
+
+-- separate types means more code here, but it's easier to use in the
+-- scaffold
+
+-- | Information required to connect to a postgres database
+data PostgresConf = PostgresConf
+    { pgConnStr  :: Text
+    , pgPoolSize :: Int
+    }
+
+-- | Information required to connect to a sqlite database
+data SqliteConf = SqliteConf
+    { sqlDatabase :: Text
+    , sqlPoolSize :: Int
+    }
+
+-- | Information required to connect to a mongo database
+data MongoConf = MongoConf
+    { mgDatabase :: String
+    , mgHost     :: String
+    , mgPoolSize :: Int
+    }
+
+-- | Load an @'AppConfig'@ from @config\/settings.yml@.
+--
+--   Some examples:
+--
+--   > -- typical local development
+--   > Development:
+--   >   host: localhost
+--   >   port: 3000
+--   >
+--   >   -- ssl: will default false
+--   >   -- approot: will default to "http://localhost:3000"
+--
+--   > -- typical outward-facing production box
+--   > Production:
+--   >   host: www.example.com
+--   >
+--   >   -- ssl: will default false
+--   >   -- port: will default 80
+--   >   -- approot: will default "http://www.example.com"
+--
+--   > -- maybe you're reverse proxying connections to the running app
+--   > -- on some other port
+--   > Production:
+--   >   port: 8080
+--   >   approot: "http://example.com"
+--   >
+--   > -- approot is specified so that the non-80 port is not appended
+--   > -- automatically.
+--
+loadConfig :: Show e => e -> IO (AppConfig e)
+loadConfig env = withYamlEnvironment "config/settings.yml" env $ \e -> do
+    let mssl     = lookupScalar "ssl"     e
+    let mhost    = lookupScalar "host"    e
+    let mport    = lookupScalar "port"    e
+    let mapproot = lookupScalar "approot" e
+
+    -- set some default arguments
+    let ssl = maybe False toBool mssl
+    port <- safeRead "port" $ fromMaybe (if ssl then "443" else "80") mport
+
+    approot <- case (mhost, mapproot) of
+        (_        , Just ar) -> return ar
+        (Just host, _      ) -> return $ (if ssl then "https://" else "http://") ++ host ++ (addPort ssl port)
+        _                    -> fail "You must supply either a host or approot"
+
+    return $ AppConfig
+        { appEnv  = env
+        , appPort = port
+        , appRoot = T.pack approot
+        }
+
+    where
+        toBool :: String -> Bool
+        toBool = (`elem` ["true", "TRUE", "yes", "YES", "Y", "1"])
+
+        addPort :: Bool -> Int -> String
+        addPort True  443 = ""
+        addPort False 80  = ""
+        addPort _     p   = ":" ++ show p
+
+-- | Load a @'PostgresConf'@ from @config\/postgresql.yml@.
+-- 
+--   > Production:
+--   >   user: jsmith
+--   >   password: secret
+--   >   host: localhost
+--   >   port: 5432
+--   >   database: some_db
+--   >   poolsize: 100
+--
+loadPostgresql :: Show e => e -> IO PostgresConf
+loadPostgresql env = withYamlEnvironment "config/postgresql.yml" env $ \e -> do
+    db   <- lookupScalar "database" e
+    pool <- safeRead "poolsize" =<< lookupScalar "poolsize" e
+
+    -- TODO: default host/port?
+    connparts <- forM ["user", "password", "host", "port"] $ \k -> do
+        v <- lookupScalar k e
+        return $ k ++ "=" ++ v ++ " "
+
+    conn <- return $ concat connparts
+
+    return $ PostgresConf (T.pack $ conn ++ " dbname=" ++ db) pool
+
+-- | Load a @'SqliteConf'@ from @config\/sqlite.yml@.
+--
+--   > Production:
+--   >   database: foo.s3db
+--   >   poolsize: 100
+--
+loadSqlite :: Show e => e -> IO SqliteConf
+loadSqlite env = withYamlEnvironment "config/sqlite.yml" env $ \e -> do
+    db   <- lookupScalar "database" e
+    pool <- safeRead "poolsize" =<< lookupScalar "poolsize" e
+
+    return $ SqliteConf (T.pack db) pool
+
+-- | Load a @'MongoConf'@ from @config\/mongoDB.yml@.
+--
+--   > Production:
+--   >   database: some_db
+--   >   host:     localhost
+--   >   poolsize: 100
+--
+loadMongo :: Show e => e -> IO MongoConf
+loadMongo env = withYamlEnvironment "config/mongoDB.yml" env $ \e -> do
+    db   <- lookupScalar "database" e
+    host <- lookupScalar "host"     e
+    pool <- safeRead "poolsize" =<< lookupScalar "poolsize" e
+
+    return $ MongoConf db host pool
+
+-- | Loads the configuration block in the passed file named by the
+--   passed environment, yeilds to the passed function as a mapping.
+--
+--   Errors in the case of a bad load or if your function returns
+--   @Nothing@.
+withYamlEnvironment :: (IsYamlScalar v, Show e)
+                    => FilePath -- ^ the yaml file
+                    -> e        -- ^ the environment you want to load
+                    -> ([(String, Object String v)] -> IO a) -- ^ what to do with the mapping
+                    -> IO a
+withYamlEnvironment fp env f = do
+    obj <- join $ decodeFile fp
+    envs <- fromMapping obj
+    conf <- lookupMapping (show env) envs
+    f conf
+
+-- | Returns 'fail' if read fails
+safeRead :: Monad m => String -> String -> m Int
+safeRead name s = case reads s of
+    (i, _):_ -> return i
+    []       -> fail $ concat ["Invalid value for ", name, ": ", s]
diff --git a/yesod-core/Yesod/Core.hs b/yesod-core/Yesod/Core.hs
index 9f137991..2e395856 100644
--- a/yesod-core/Yesod/Core.hs
+++ b/yesod-core/Yesod/Core.hs
@@ -33,6 +33,7 @@ module Yesod.Core
     , module Yesod.Request
     , module Yesod.Widget
     , module Yesod.Message
+    , module Yesod.Config
     ) where
 
 import Yesod.Internal.Core
@@ -42,6 +43,7 @@ import Yesod.Handler
 import Yesod.Request
 import Yesod.Widget
 import Yesod.Message
+import Yesod.Config
 
 import Language.Haskell.TH.Syntax
 import Data.Text (Text)
diff --git a/yesod-core/yesod-core.cabal b/yesod-core/yesod-core.cabal
index 9e73aef9..12d2e97b 100644
--- a/yesod-core/yesod-core.cabal
+++ b/yesod-core/yesod-core.cabal
@@ -54,6 +54,8 @@ library
                    , case-insensitive          >= 0.2      && < 0.4
                    , parsec                    >= 2        && < 3.2
                    , directory                 >= 1        && < 1.2
+                   , data-object               >= 0.3      && < 0.4
+                   , data-object-yaml          >= 0.3      && < 0.4
                    -- for logger. Probably logger should be a separate package
                    , strict-concurrency        >= 0.2.4    && < 0.2.5
 
@@ -65,6 +67,7 @@ library
                      Yesod.Request
                      Yesod.Widget
                      Yesod.Message
+                     Yesod.Config
                      Yesod.Internal.TestApi
     other-modules:   Yesod.Internal
                      Yesod.Internal.Core
diff --git a/yesod-default/LICENSE b/yesod-default/LICENSE
new file mode 100644
index 00000000..8643e5d8
--- /dev/null
+++ b/yesod-default/LICENSE
@@ -0,0 +1,25 @@
+The following license covers this documentation, and the source code, except
+where otherwise indicated.
+
+Copyright 2010, Michael Snoyman. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS "AS IS" AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/yesod-default/README b/yesod-default/README
new file mode 100644
index 00000000..e69de29b
diff --git a/yesod-default/Setup.lhs b/yesod-default/Setup.lhs
new file mode 100755
index 00000000..06e2708f
--- /dev/null
+++ b/yesod-default/Setup.lhs
@@ -0,0 +1,7 @@
+#!/usr/bin/env runhaskell
+
+> module Main where
+> import Distribution.Simple
+
+> main :: IO ()
+> main = defaultMain
diff --git a/yesod-default/Yesod/Default/Config.hs b/yesod-default/Yesod/Default/Config.hs
new file mode 100644
index 00000000..742967bb
--- /dev/null
+++ b/yesod-default/Yesod/Default/Config.hs
@@ -0,0 +1,75 @@
+{-# LANGUAGE DeriveDataTypeable #-}
+module Yesod.Default.Config
+    ( DefaultEnv(..)
+    , ArgConfig(..)
+    , defaultArgConfig
+    , fromArgs
+    , fromArgsWith
+    , loadDevelopmentConfig
+
+    -- reexport
+    , module Yesod.Config
+    ) where
+
+import Yesod.Config
+import Data.Char (toUpper, toLower)
+import System.Console.CmdArgs hiding (args)
+
+-- | A yesod-provided @'AppEnv'@, allows for Development, Testing, and
+--   Production environments
+data DefaultEnv = Development
+                | Testing
+                | Staging
+                | Production deriving (Read, Show, Enum, Bounded)
+
+-- | Setup commandline arguments for environment and port
+data ArgConfig = ArgConfig
+    { environment :: String
+    , port        :: Int
+    } deriving (Show, Data, Typeable)
+
+-- | A default @'ArgConfig'@ if using the provided @'DefaultEnv'@ type.
+defaultArgConfig :: ArgConfig
+defaultArgConfig =
+    ArgConfig
+        { environment = "development"
+            &= help ("application environment, one of: " ++ environments)
+            &= typ   "ENVIRONMENT"
+        , port = def
+            &= help "the port to listen on"
+            &= typ  "PORT"
+        }
+
+    where
+        environments :: String
+        environments = foldl1 (\a b -> a ++ ", " ++ b)
+                     . map ((map toLower) . show)
+                     $ ([minBound..maxBound] :: [DefaultEnv])
+
+-- | Load an @'AppConfig'@ using the @'DefaultEnv'@ environments from
+--   commandline arguments.
+fromArgs :: IO (AppConfig DefaultEnv)
+fromArgs = fromArgsWith defaultArgConfig
+
+fromArgsWith :: (Read e, Show e) => ArgConfig -> IO (AppConfig e)
+fromArgsWith argConfig = do
+    args   <- cmdArgs argConfig
+
+    env <-
+        case reads $ capitalize $ environment args of
+            (e, _):_ -> return e
+            [] -> error $ "Invalid environment: " ++ environment args
+
+    config <- loadConfig env
+
+    return $ if port args /= 0
+                then config { appPort = port args }
+                else config
+
+    where
+        capitalize [] = []
+        capitalize (x:xs) = toUpper x : map toLower xs
+
+-- | Load your development config (when using @'DefaultEnv'@)
+loadDevelopmentConfig :: IO (AppConfig DefaultEnv)
+loadDevelopmentConfig = loadConfig Development
diff --git a/yesod-default/Yesod/Default/Main.hs b/yesod-default/Yesod/Default/Main.hs
new file mode 100644
index 00000000..f19e5d41
--- /dev/null
+++ b/yesod-default/Yesod/Default/Main.hs
@@ -0,0 +1,63 @@
+{-# LANGUAGE DeriveDataTypeable #-}
+module Yesod.Default.Main
+    ( defaultMain
+    , defaultDevelApp
+    , defaultDevelAppWith
+    ) where
+
+import Yesod.Default.Config
+import Yesod.Logger (Logger, makeLogger, logString, logLazyText, flushLogger)
+import Network.Wai (Application)
+import Network.Wai.Handler.Warp (run)
+import Network.Wai.Middleware.Debug (debugHandle)
+
+-- | Run your app, taking environment and port settings from the
+--   commandline.
+--
+--   Use @'fromArgs'@ when using the provided @'DefaultEnv'@ type, or
+--   @'fromArgsWith'@ when using a custom type
+--
+--   > main :: IO ()
+--   > main = defaultMain fromArgs withMySite
+--
+--   or
+--
+--   > main :: IO ()
+--   > main = defaultMain (fromArgsWith customArgConfig) withMySite
+--
+defaultMain :: (Show e, Read e) => IO (AppConfig e) -> (AppConfig e -> Logger -> (Application -> IO ()) -> IO ()) -> IO ()
+defaultMain load withSite = do
+    config <- load
+    logger <- makeLogger
+    withSite config logger $ run (appPort config)
+
+-- | Run your development app using the provided @'DefaultEnv'@ type
+--
+--   > withDevelAppPort :: Dynamic
+--   > withDevelAppPort = toDyn $ defaultDevelApp withMySite
+--
+defaultDevelApp :: (AppConfig DefaultEnv -> Logger -> (Application -> IO ()) -> IO ())
+                -> ((Int, Application) -> IO ())
+                -> IO ()
+defaultDevelApp = defaultDevelAppWith loadDevelopmentConfig
+
+-- | Run your development app using a custom environment type and loader
+--   function
+--
+--   > withDevelAppPort :: Dynamic
+--   > withDevelAppPort = toDyn $ (defaultDevelAppWith customLoadAppConfig) withMySite
+--
+defaultDevelAppWith :: (Show e, Read e)
+                    => IO (AppConfig e) -- ^ A means to load your development @'AppConfig'@
+                    -> (AppConfig e -> Logger -> (Application -> IO ()) -> IO ()) -- ^ Your @withMySite@ function
+                    -> ((Int, Application) -> IO ()) -> IO ()
+defaultDevelAppWith load withSite f = do
+        conf   <- load
+        logger <- makeLogger
+        let p = appPort conf
+        logString logger $ "Devel application launched, listening on port " ++ show p
+        withSite conf logger $ \app -> f (p, debugHandle (logHandle logger) app)
+        flushLogger logger
+
+        where
+            logHandle logger msg = logLazyText logger msg >> flushLogger logger
diff --git a/yesod-default/Yesod/Default/Util.hs b/yesod-default/Yesod/Default/Util.hs
new file mode 100644
index 00000000..ba36cb14
--- /dev/null
+++ b/yesod-default/Yesod/Default/Util.hs
@@ -0,0 +1,43 @@
+{-# LANGUAGE OverloadedStrings #-}
+-- | Various utilities used in the scaffolded site.
+module Yesod.Default.Util
+    ( addStaticContentExternal
+    ) where
+
+import Control.Monad.IO.Class (liftIO)
+import qualified Data.ByteString.Lazy as L
+import Data.Text (Text, pack, unpack)
+import Yesod.Core -- purposely using complete import so that Haddock will see addStaticContent
+import Control.Monad (unless)
+import System.Directory (doesFileExist, createDirectoryIfMissing)
+
+-- | An implementation of 'addStaticContent' which stores the contents in an
+-- external file. Files are created in the given static folder with names based
+-- on a hash of their content. This allows expiration dates to be set far in
+-- the future without worry of users receiving stale content.
+addStaticContentExternal
+    :: (L.ByteString -> Either a L.ByteString) -- ^ javascript minifier
+    -> (L.ByteString -> String) -- ^ hash function to determine file name
+    -> FilePath -- ^ location of static directory. files will be placed within a "tmp" subfolder
+    -> ([Text] -> Route master) -- ^ route constructor, taking a list of pieces
+    -> Text -- ^ filename extension
+    -> Text -- ^ mime type
+    -> L.ByteString -- ^ file contents
+    -> GHandler sub master (Maybe (Either Text (Route master, [(Text, Text)])))
+addStaticContentExternal minify hash staticDir toRoute ext' _ content = do
+    liftIO $ createDirectoryIfMissing True statictmp
+    exists <- liftIO $ doesFileExist fn'
+    unless exists $ liftIO $ L.writeFile fn' content'
+    return $ Just $ Right (toRoute ["tmp", pack fn], [])
+  where
+    fn, statictmp, fn' :: FilePath
+    -- by basing the hash off of the un-minified content, we avoid a costly
+    -- minification if the file already exists
+    fn = hash content ++ '.' : unpack ext'
+    statictmp = staticDir ++ "/tmp/"
+    fn' = statictmp ++ fn
+
+    content' :: L.ByteString
+    content'
+        | ext' == "js" = either (const content) id $ minify content
+        | otherwise = content
diff --git a/yesod-default/yesod-default.cabal b/yesod-default/yesod-default.cabal
new file mode 100644
index 00000000..8eea3d63
--- /dev/null
+++ b/yesod-default/yesod-default.cabal
@@ -0,0 +1,36 @@
+name:            yesod-default
+version:         0.3.1
+license:         BSD3
+license-file:    LICENSE
+author:          Patrick Brisbin
+maintainer:      Patrick Brisbin <pbrisbin@gmail.com>
+synopsis:        Default config and main functions for your yesod application
+category:        Web, Yesod
+stability:       Stable
+cabal-version:   >= 1.6
+build-type:      Simple
+homepage:        http://www.yesodweb.com/
+description:     Convenient wrappers for your the configuration and
+                 execution of your yesod application
+
+library
+    build-depends:   base              >= 4   && < 5
+                   , yesod-core        >= 0.9 && < 0.10
+                   , cmdargs           >= 0.8 && < 0.9
+                   , warp              >= 0.4 && < 0.5
+                   , wai               >= 0.4 && < 0.5
+                   , wai-extra         >= 0.4 && < 0.5
+                   , bytestring        >= 0.9 && < 0.10
+                   , transformers      >= 0.2 && < 0.3
+                   , text              >= 0.9 && < 1.0
+                   , directory         >= 1.0 && < 1.2
+
+    exposed-modules: Yesod.Default.Config
+                   , Yesod.Default.Main
+                   , Yesod.Default.Util
+
+    ghc-options:     -Wall
+
+source-repository head
+  type:     git
+  location: git://github.com/yesodweb/yesod.git
diff --git a/yesod-form/Yesod/Form/Functions.hs b/yesod-form/Yesod/Form/Functions.hs
index b5910e4e..f762b621 100644
--- a/yesod-form/Yesod/Form/Functions.hs
+++ b/yesod-form/Yesod/Form/Functions.hs
@@ -31,6 +31,7 @@ module Yesod.Form.Functions
     , check
     , checkBool
     , checkM
+    , customErrorMessage
     ) where
 
 import Yesod.Form.Types
@@ -309,3 +310,8 @@ checkM f field = field
             Right Nothing -> return $ Right Nothing
             Right (Just a) -> fmap (either (Left . SomeMessage) (Right . Just)) $ f a
     }
+
+-- | Allows you to overwrite the error message on parse error.
+customErrorMessage :: SomeMessage master -> Field sub master a -> Field sub master a
+customErrorMessage msg field = field { fieldParse = \ts -> fmap (either
+(const $ Left msg) Right) $ fieldParse field ts }
diff --git a/yesod-static/Yesod/Static.hs b/yesod-static/Yesod/Static.hs
index f26813b7..be5e45e8 100644
--- a/yesod-static/Yesod/Static.hs
+++ b/yesod-static/Yesod/Static.hs
@@ -29,6 +29,7 @@ module Yesod.Static
     , embed
       -- * Template Haskell helpers
     , staticFiles
+    , staticFilesList
     , publicFiles
       -- * Hashing
     , base64md5
@@ -155,6 +156,25 @@ getFileListPieces = flip go id
 staticFiles :: Prelude.FilePath -> Q [Dec]
 staticFiles dir = mkStaticFiles dir
 
+-- | Same as 'staticFiles', but takes an explicit list of files to create
+-- identifiers for. The files are given relative to the static folder. For
+-- example, to get the files \"static/js/jquery.js\" and
+-- \"static/css/normalize.css\", you would use:
+--
+-- > staticFilesList "static" ["js/jquery.js"], ["css/normalize.css"]]
+--
+-- This can be useful when you have a very large number of static files, but
+-- only need to refer to a few of them from Haskell.
+staticFilesList :: Prelude.FilePath -> [Prelude.FilePath] -> Q [Dec]
+staticFilesList dir fs =
+    mkStaticFilesList dir (map split fs) "StaticRoute" True
+  where
+    split :: Prelude.FilePath -> [String]
+    split [] = []
+    split x =
+        let (a, b) = break (== '/') x
+         in a : split (drop 1 b)
+
 -- | like staticFiles, but doesn't append an etag to the query string
 -- This will compile faster, but doesn't achieve as great of caching.
 -- The browser can avoid downloading the file, but it always needs to send a request with the etag value or the last-modified value to the server to see if its copy is up to dat
@@ -212,6 +232,15 @@ mkStaticFiles' :: Prelude.FilePath -- ^ static directory
                -> Q [Dec]
 mkStaticFiles' fp routeConName makeHash = do
     fs <- qRunIO $ getFileListPieces fp
+    mkStaticFilesList fp fs routeConName makeHash
+
+mkStaticFilesList
+    :: Prelude.FilePath -- ^ static directory
+    -> [[String]] -- ^ list of files to create identifiers for
+    -> String   -- ^ route constructor "StaticRoute"
+    -> Bool     -- ^ append checksum query parameter
+    -> Q [Dec]
+mkStaticFilesList fp fs routeConName makeHash = do
     concat `fmap` mapM mkRoute fs
   where
     replace' c
@@ -233,7 +262,6 @@ mkStaticFiles' fp routeConName makeHash = do
         pack' <- [|pack|]
         qs <- if makeHash
                     then do hash <- qRunIO $ base64md5File $ pathFromRawPieces fp f
-        -- FIXME hash <- qRunIO . calcHash $ fp ++ '/' : intercalate "/" f
                             [|[(pack $(lift hash), mempty)]|]
                     else return $ ListE []
         return
diff --git a/yesod-static/yesod-static.cabal b/yesod-static/yesod-static.cabal
index e503db0c..18e26a80 100644
--- a/yesod-static/yesod-static.cabal
+++ b/yesod-static/yesod-static.cabal
@@ -1,5 +1,5 @@
 name:            yesod-static
-version:         0.3.0.1
+version:         0.3.1
 license:         BSD3
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>
diff --git a/yesod/Devel.hs b/yesod/Devel.hs
index 03d8795f..09ce09aa 100755
--- a/yesod/Devel.hs
+++ b/yesod/Devel.hs
@@ -66,8 +66,8 @@ devel isDevel = do
       checkCabalFile gpd
 
       _ <- if isDevel
-        then rawSystem "cabal-dev" ["configure", "--cabal-install-arg=-fdevel"]
-        else rawSystem "cabal"     ["configure", "-fdevel"]
+        then rawSystem "cabal-dev" ["configure", "--cabal-install-arg=-fdevel", "--disable-library-profiling"]
+        else rawSystem "cabal"     ["configure", "-fdevel", "--disable-library-profiling"]
 
       T.writeFile "dist/devel.hs" (develFile pid)
 
diff --git a/yesod/Scaffolding/Scaffolder.hs b/yesod/Scaffolding/Scaffolder.hs
index 287bb8a9..5cd5569e 100644
--- a/yesod/Scaffolding/Scaffolder.hs
+++ b/yesod/Scaffolding/Scaffolder.hs
@@ -94,10 +94,6 @@ scaffold = do
           MongoDB    -> $(codegen $ "mongoDBConnPool")
           Tiny       -> ""
 
-        settingsTextImport = case backend of
-          Postgresql -> "import Data.Text (Text, pack, concat)\nimport Prelude hiding (concat)"
-          _          -> "import Data.Text (Text, pack)"
-
         packages =
           if backend == MongoDB
             then "                 , persistent-mongoDB >= 0.6.1 && < 0.7\n                 , mongoDB >= 1.1\n                 , bson >= 0.1.5\n"
@@ -124,6 +120,7 @@ scaffold = do
     mkDir "Model"
     mkDir "deploy"
     mkDir "Settings"
+    mkDir "messages"
      
     writeFile' ("deploy/Procfile") $(codegen "deploy/Procfile")
 
@@ -143,24 +140,25 @@ scaffold = do
     writeFile' "LICENSE" $(codegen "LICENSE")
     writeFile' ("Foundation.hs") $ ifTiny $(codegen "tiny/Foundation.hs") $(codegen "Foundation.hs")
     writeFile' "Application.hs" $ ifTiny $(codegen "tiny/Application.hs") $(codegen "Application.hs")
-    writeFile' "Handler/Root.hs" $ ifTiny $(codegen "tiny/Handler/Root.hs") $(codegen "Handler/Root.hs")
+    writeFile' "Handler/Root.hs" $(codegen "Handler/Root.hs")
     unless isTiny $ writeFile' "Model.hs" $(codegen "Model.hs")
     writeFile' "Settings.hs" $ ifTiny $(codegen "tiny/Settings.hs") $(codegen "Settings.hs")
     writeFile' "Settings/StaticFiles.hs" $(codegen "Settings/StaticFiles.hs")
-    writeFile' "cassius/default-layout.cassius"
-        $(codegen "cassius/default-layout.cassius")
+    writeFile' "lucius/default-layout.lucius"
+        $(codegen "lucius/default-layout.lucius")
     writeFile' "hamlet/default-layout.hamlet"
         $(codegen "hamlet/default-layout.hamlet")
     writeFile' "hamlet/boilerplate-layout.hamlet"
         $(codegen "hamlet/boilerplate-layout.hamlet")
-    writeFile' "static/css/normalize.css"
-        $(codegen "static/css/normalize.css")
-    writeFile' "hamlet/homepage.hamlet" $ ifTiny $(codegen "tiny/hamlet/homepage.hamlet") $(codegen "hamlet/homepage.hamlet")
+    writeFile' "lucius/normalize.lucius"
+        $(codegen "lucius/normalize.lucius")
+    writeFile' "hamlet/homepage.hamlet" $(codegen "hamlet/homepage.hamlet")
     writeFile' "config/routes" $ ifTiny $(codegen "tiny/config/routes") $(codegen "config/routes")
-    writeFile' "cassius/homepage.cassius" $(codegen "cassius/homepage.cassius")
+    writeFile' "lucius/homepage.lucius" $(codegen "lucius/homepage.lucius")
     writeFile' "julius/homepage.julius" $(codegen "julius/homepage.julius")
     unless isTiny $ writeFile' "config/models" $(codegen "config/models")
-  
+    writeFile' "messages/en.msg" $(codegen "messages/en.msg")
+
     S.writeFile (dir ++ "/config/favicon.ico")
         $(runIO (S.readFile "scaffold/config/favicon.ico.cg") >>= \bs -> do
             pack <- [|S.pack|]
diff --git a/yesod/scaffold/Application.hs.cg b/yesod/scaffold/Application.hs.cg
index 03153b5a..6c9a5c65 100644
--- a/yesod/scaffold/Application.hs.cg
+++ b/yesod/scaffold/Application.hs.cg
@@ -12,11 +12,12 @@ import Foundation
 import Settings
 import Settings.StaticFiles (static)
 import Yesod.Auth
-import Yesod.Logger (makeLogger, flushLogger, Logger, logString, logLazyText)
+import Yesod.Default.Config
+import Yesod.Default.Main
+import Yesod.Logger (Logger)
 import Database.Persist.~importGenericDB~
 import Data.ByteString (ByteString)
 import Data.Dynamic (Dynamic, toDyn)
-import Network.Wai.Middleware.Debug (debugHandle)
 
 #ifndef WINDOWS
 import qualified System.Posix.Signals as Signal
@@ -44,7 +45,7 @@ getRobotsR = return $ RepPlain $ toContent ("User-agent: *" :: ByteString)
 -- performs initialization and creates a WAI application. This is also the
 -- place to put your migrate statements to have automatic database
 -- migrations handled by Yesod.
-with~sitearg~ :: AppConfig -> Logger -> (Application -> IO a) -> IO ()
+with~sitearg~ :: AppConfig DefaultEnv -> Logger -> (Application -> IO a) -> IO ()
 with~sitearg~ conf logger f = do
     s <- static Settings.staticDir
     Settings.withConnectionPool conf $ \p -> do~runMigration~
@@ -63,16 +64,4 @@ with~sitearg~ conf logger f = do
 
 -- for yesod devel
 withDevelAppPort :: Dynamic
-withDevelAppPort =
-    toDyn go
-  where
-    go :: ((Int, Application) -> IO ()) -> IO ()
-    go f = do
-        conf <- Settings.loadConfig Settings.Development
-        let port = appPort conf
-        logger <- makeLogger
-        logString logger $ "Devel application launched, listening on port " ++ show port
-        with~sitearg~ conf logger $ \app -> f (port, debugHandle (logHandle logger) app)
-        flushLogger logger
-      where
-        logHandle logger msg = logLazyText logger msg >> flushLogger logger
+withDevelAppPort = toDyn $ defaultDevelApp with~sitearg~
diff --git a/yesod/scaffold/Foundation.hs.cg b/yesod/scaffold/Foundation.hs.cg
index 3f000eb5..d0740589 100644
--- a/yesod/scaffold/Foundation.hs.cg
+++ b/yesod/scaffold/Foundation.hs.cg
@@ -4,6 +4,7 @@
 module Foundation
     ( ~sitearg~ (..)
     , ~sitearg~Route (..)
+    , ~sitearg~Message (..)
     , resources~sitearg~
     , Handler
     , Widget
@@ -22,19 +23,19 @@ import Settings.StaticFiles
 import Yesod.Auth
 import Yesod.Auth.OpenId
 import Yesod.Auth.Email
+import Yesod.Default.Config
+import Yesod.Default.Util (addStaticContentExternal)
 import Yesod.Logger (Logger, logLazyText)
 import qualified Settings
-import System.Directory
 import qualified Data.ByteString.Lazy as L
 import Database.Persist.~importGenericDB~
 import Settings (hamletFile, cassiusFile, luciusFile, juliusFile, widgetFile)
 import Model
 import Data.Maybe (isJust)
-import Control.Monad (join, unless)
+import Control.Monad (join)
 import Network.Mail.Mime
 import qualified Data.Text.Lazy.Encoding
 import Text.Jasmine (minifym)
-import qualified Data.Text as T
 import Web.ClientSession (getKey)
 import Text.Blaze.Renderer.Utf8 (renderHtml)
 import Text.Hamlet (shamlet)
@@ -45,12 +46,15 @@ import Text.Shakespeare.Text (stext)
 -- starts running, such as database connections. Every handler will have
 -- access to the data present here.
 data ~sitearg~ = ~sitearg~
-    { settings :: Settings.AppConfig
+    { settings :: AppConfig DefaultEnv
     , getLogger :: Logger
     , getStatic :: Static -- ^ Settings for static file serving.
     , connPool :: Settings.ConnectionPool -- ^ Database connection pool.
     }
 
+-- Set up i18n messages. See the message folder.
+mkMessage "~sitearg~" "messages" "en"
+
 -- This is where we define all of the routes in our application. For a full
 -- explanation of the syntax, please see:
 -- http://www.yesodweb.com/book/handler
@@ -75,7 +79,7 @@ mkYesodData "~sitearg~" $(parseRoutesFile "config/routes")
 -- Please see the documentation for the Yesod typeclass. There are a number
 -- of settings which can be configured by overriding methods here.
 instance Yesod ~sitearg~ where
-    approot = Settings.appRoot . settings
+    approot = appRoot . settings
 
     -- Place the session key file in the config folder
     encryptKey _ = fmap Just $ getKey "config/client_session_key.aes"
@@ -84,7 +88,8 @@ instance Yesod ~sitearg~ where
         mmsg <- getMessage
         pc <- widgetToPageContent $ do
             widget
-            addCassius $(cassiusFile "default-layout")
+            toWidget $(luciusFile "normalize")
+            toWidget $(luciusFile "default-layout")
         hamletToRepHtml $(hamletFile "default-layout")
 
     -- This is done to provide an optimization for serving static files from
@@ -103,21 +108,7 @@ instance Yesod ~sitearg~ where
     -- and names them based on a hash of their content. This allows
     -- expiration dates to be set far in the future without worry of
     -- users receiving stale content.
-    addStaticContent ext' _ content = do
-        let fn = base64md5 content ++ '.' : T.unpack ext'
-        let content' =
-                if ext' == "js"
-                    then case minifym content of
-                            Left _ -> content
-                            Right y -> y
-                    else content
-        let statictmp = Settings.staticDir ++ "/tmp/"
-        liftIO $ createDirectoryIfMissing True statictmp
-        let fn' = statictmp ++ fn
-        exists <- liftIO $ doesFileExist fn'
-        unless exists $ liftIO $ L.writeFile fn' content'
-        return $ Just $ Right (StaticR $ StaticRoute ["tmp", T.pack fn] [], [])
-
+    addStaticContent = addStaticContentExternal minifym base64md5 Settings.staticDir (StaticR . flip StaticRoute [])
 
 -- How to run database actions.
 instance YesodPersist ~sitearg~ where
diff --git a/yesod/scaffold/Handler/Root.hs.cg b/yesod/scaffold/Handler/Root.hs.cg
index 99bf711d..e485b7cd 100644
--- a/yesod/scaffold/Handler/Root.hs.cg
+++ b/yesod/scaffold/Handler/Root.hs.cg
@@ -12,7 +12,6 @@ import Foundation
 -- inclined, or create a single monolithic file.
 getRootR :: Handler RepHtml
 getRootR = do
-    mu <- maybeAuth
     defaultLayout $ do
         h2id <- lift newIdent
         setTitle "~project~ homepage"
diff --git a/yesod/scaffold/Settings.hs.cg b/yesod/scaffold/Settings.hs.cg
index 9109198e..c60fb3f6 100644
--- a/yesod/scaffold/Settings.hs.cg
+++ b/yesod/scaffold/Settings.hs.cg
@@ -18,9 +18,6 @@ module Settings
     , runConnectionPool
     , staticRoot
     , staticDir
-    , loadConfig
-    , AppEnvironment(..)
-    , AppConfig(..)
     ) where
 
 import qualified Text.Hamlet as S
@@ -32,75 +29,11 @@ import Text.Shakespeare.Text (st)
 import Language.Haskell.TH.Syntax
 import Database.Persist.~importPersist~
 import Yesod (liftIO, MonadControlIO, addWidget, addCassius, addJulius, addLucius, whamletFile)
+import Yesod.Default.Config
 import Data.Monoid (mempty)
 import System.Directory (doesFileExist)
-~settingsTextImport~
-import Data.Object
-import qualified Data.Object.Yaml as YAML
-import Control.Monad (join)
+import Data.Text (Text)
 
-data AppEnvironment = Test
-                    | Development
-                    | Staging
-                    | Production
-                    deriving (Eq, Show, Read, Enum, Bounded)
-
--- | Dynamic per-environment configuration loaded from the YAML file Settings.yaml.
--- Use dynamic settings to avoid the need to re-compile the application (between staging and production environments).
---
--- By convention these settings should be overwritten by any command line arguments.
--- See config/Foundation.hs for command line arguments
--- Command line arguments provide some convenience but are also required for hosting situations where a setting is read from the environment (appPort on Heroku).
---
-data AppConfig = AppConfig {
-    appEnv :: AppEnvironment
-
-  , appPort :: Int
-
-    -- | Your application will keep a connection pool and take connections from
-    -- there as necessary instead of continually creating new connections. This
-    -- value gives the maximum number of connections to be open at a given time.
-    -- If your application requests a connection when all connections are in
-    -- use, that request will fail. Try to choose a number that will work well
-    -- with the system resources available to you while providing enough
-    -- connections for your expected load.
-    --
-    -- Connections are returned to the pool as quickly as possible by
-    -- Yesod to avoid resource exhaustion. A connection is only considered in
-    -- use while within a call to runDB.
-  , connectionPoolSize :: Int
-
-    -- | The base URL for your application. This will usually be different for
-    -- development and production. Yesod automatically constructs URLs for you,
-    -- so this value must be accurate to create valid links.
-    -- Please note that there is no trailing slash.
-    --
-    -- You probably want to change this! If your domain name was "yesod.com",
-    -- you would probably want it to be:
-    -- > "http://yesod.com"
-  , appRoot :: Text
-} deriving (Show)
-
-loadConfig :: AppEnvironment -> IO AppConfig
-loadConfig env = do
-    allSettings <- (join $ YAML.decodeFile ("config/settings.yml" :: String)) >>= fromMapping
-    settings <- lookupMapping (show env) allSettings
-    hostS <- lookupScalar "host" settings
-    port <- fmap read $ lookupScalar "port" settings
-    connectionPoolSizeS <- lookupScalar "connectionPoolSize" settings
-    return $ AppConfig {
-      appEnv = env
-    , appPort = port
-    , appRoot = pack $ hostS ++ addPort port
-    , connectionPoolSize = read connectionPoolSizeS
-    }
-    where
-        addPort :: Int -> String
-#ifdef PRODUCTION
-        addPort _ = ""
-#else
-        addPort p = ":" ++ (show p)
-#endif
 
 -- Static setting below. Changing these requires a recompile
 
@@ -122,7 +55,7 @@ staticDir = "static"
 -- have to make a corresponding change here.
 --
 -- To see how this value is used, see urlRenderOverride in Foundation.hs
-staticRoot :: AppConfig ->  Text
+staticRoot :: AppConfig DefaultEnv ->  Text
 staticRoot conf = [st|#{appRoot conf}/static|]
 
 
diff --git a/yesod/scaffold/cassius/default-layout.cassius.cg b/yesod/scaffold/cassius/default-layout.cassius.cg
deleted file mode 100644
index 77177469..00000000
--- a/yesod/scaffold/cassius/default-layout.cassius.cg
+++ /dev/null
@@ -1,3 +0,0 @@
-body
-    font-family: sans-serif
-
diff --git a/yesod/scaffold/config/mongoDB.yml.cg b/yesod/scaffold/config/mongoDB.yml.cg
index 60f74187..b97d7dfa 100644
--- a/yesod/scaffold/config/mongoDB.yml.cg
+++ b/yesod/scaffold/config/mongoDB.yml.cg
@@ -4,6 +4,7 @@ Default: &defaults
   host: localhost
   port: 27017
   database: ~project~
+  poolsize: 10
 
 Development:
   <<: *defaults
@@ -14,8 +15,10 @@ Test:
 
 Staging:
   database: ~project~_staging
+  poolsize: 100
   <<: *defaults
 
 Production:
   database: ~project~_production
+  poolsize: 100
   <<: *defaults
diff --git a/yesod/scaffold/config/postgresql.yml.cg b/yesod/scaffold/config/postgresql.yml.cg
index 2f60ddab..aceae393 100644
--- a/yesod/scaffold/config/postgresql.yml.cg
+++ b/yesod/scaffold/config/postgresql.yml.cg
@@ -4,6 +4,7 @@ Default: &defaults
   host: localhost
   port: 5432
   database: ~project~
+  poolsize: 10
 
 Development:
   <<: *defaults
@@ -14,7 +15,10 @@ Test:
 
 Staging:
   database: ~project~_staging
+  poolsize: 100
+  <<: *defaults
 
 Production:
   database: ~project~_production
+  poolsize: 100
   <<: *defaults
diff --git a/yesod/scaffold/config/settings.yml.cg b/yesod/scaffold/config/settings.yml.cg
index 1485242c..816a2db6 100644
--- a/yesod/scaffold/config/settings.yml.cg
+++ b/yesod/scaffold/config/settings.yml.cg
@@ -1,7 +1,6 @@
 Default: &defaults
-  host: "http://localhost"
+  host: "localhost"
   port: 3000
-  connectionPoolSize: 10
 
 Development:
   <<: *defaults
@@ -13,4 +12,5 @@ Staging:
   <<: *defaults
 
 Production:
+  approot: "http://www.example.com"
   <<: *defaults
diff --git a/yesod/scaffold/config/sqlite.yml.cg b/yesod/scaffold/config/sqlite.yml.cg
index b9f01df1..ebee1fa8 100644
--- a/yesod/scaffold/config/sqlite.yml.cg
+++ b/yesod/scaffold/config/sqlite.yml.cg
@@ -1,5 +1,6 @@
 Default: &defaults
   database: ~project~.sqlite3
+  poolsize: 10
 
 Development:
   <<: *defaults
@@ -10,8 +11,10 @@ Test:
 
 Staging:
   database: ~project~_staging.sqlite3
+  poolsize: 100
   <<: *defaults
 
 Production:
   database: ~project~_production.sqlite3
+  poolsize: 100
   <<: *defaults
diff --git a/yesod/scaffold/hamlet/boilerplate-layout.hamlet.cg b/yesod/scaffold/hamlet/boilerplate-layout.hamlet.cg
index 522df932..22a5aca4 100644
--- a/yesod/scaffold/hamlet/boilerplate-layout.hamlet.cg
+++ b/yesod/scaffold/hamlet/boilerplate-layout.hamlet.cg
@@ -15,7 +15,6 @@
 
         <title>#{pageTitle pc}
 
-        <link rel="stylesheet" href=@{StaticR css_normalize_css}>
         ^{pageHead pc}
       
         <!--[if lt IE 9]>
diff --git a/yesod/scaffold/hamlet/default-layout.hamlet.cg b/yesod/scaffold/hamlet/default-layout.hamlet.cg
index 0a4d08f4..f31acb19 100644
--- a/yesod/scaffold/hamlet/default-layout.hamlet.cg
+++ b/yesod/scaffold/hamlet/default-layout.hamlet.cg
@@ -2,7 +2,6 @@
 <html
     <head
         <title>#{pageTitle pc}
-        <link rel="stylesheet" href=@{StaticR css_normalize_css}>
         ^{pageHead pc}
     <body
         $maybe msg <- mmsg
diff --git a/yesod/scaffold/hamlet/homepage.hamlet.cg b/yesod/scaffold/hamlet/homepage.hamlet.cg
index 727f0eb6..e8907860 100644
--- a/yesod/scaffold/hamlet/homepage.hamlet.cg
+++ b/yesod/scaffold/hamlet/homepage.hamlet.cg
@@ -1,13 +1,2 @@
-<h1>Hello
+<h1>_{MsgHello}
 <h2 ##{h2id}>You do not have Javascript enabled.
-$maybe u <- mu
-    <p
-        You are logged in as #{userIdent $ snd u}. #
-        <a href=@{AuthR LogoutR}>Logout
-        .
-$nothing
-    <p
-        You are not logged in. #
-        <a href=@{AuthR LoginR}>Login now
-        .
-
diff --git a/yesod/scaffold/lucius/default-layout.lucius.cg b/yesod/scaffold/lucius/default-layout.lucius.cg
new file mode 100644
index 00000000..799dec4f
--- /dev/null
+++ b/yesod/scaffold/lucius/default-layout.lucius.cg
@@ -0,0 +1,4 @@
+body {
+    font-family: sans-serif;
+}
+
diff --git a/yesod/scaffold/cassius/homepage.cassius.cg b/yesod/scaffold/lucius/homepage.lucius.cg
similarity index 64%
rename from yesod/scaffold/cassius/homepage.cassius.cg
rename to yesod/scaffold/lucius/homepage.lucius.cg
index 2ac20924..e8cf5292 100644
--- a/yesod/scaffold/cassius/homepage.cassius.cg
+++ b/yesod/scaffold/lucius/homepage.lucius.cg
@@ -1,5 +1,7 @@
-h1
+h1 {
     text-align: center
-h2##{h2id}
+}
+h2##{h2id} {
     color: #990
+}
 
diff --git a/yesod/scaffold/static/css/normalize.css.cg b/yesod/scaffold/lucius/normalize.lucius.cg
similarity index 100%
rename from yesod/scaffold/static/css/normalize.css.cg
rename to yesod/scaffold/lucius/normalize.lucius.cg
diff --git a/yesod/scaffold/main.hs.cg b/yesod/scaffold/main.hs.cg
index eede5e55..db9ccf5b 100644
--- a/yesod/scaffold/main.hs.cg
+++ b/yesod/scaffold/main.hs.cg
@@ -1,68 +1,6 @@
-{-# LANGUAGE CPP, DeriveDataTypeable #-}
-import Settings (AppEnvironment(..), AppConfig(..), loadConfig)
-import Application (with~sitearg~)
-import Network.Wai.Handler.Warp (run)
-import System.Console.CmdArgs hiding (args)
-import Data.Char (toUpper, toLower)
-
-#ifndef PRODUCTION
-import Network.Wai.Middleware.Debug (debugHandle)
-import Yesod.Logger (logString, logLazyText, flushLogger, makeLogger)
-#else
-import Yesod.Logger (makeLogger)
-#endif
+import Yesod.Default.Config (fromArgs)
+import Yesod.Default.Main   (defaultMain)
+import Application          (with~sitearg~)
 
 main :: IO ()
-main = do
-    logger <- makeLogger
-    args   <- cmdArgs argConfig
-    env    <- getAppEnv args
-    config <- loadConfig env
-    let c = if port args /= 0
-            then config { appPort = port args }
-            else config
-
-#if PRODUCTION
-    with~sitearg~ c logger $ run (appPort c)
-#else
-    logString logger $ (show env) ++ " application launched, listening on port " ++ show (appPort c)
-    with~sitearg~ c logger $ run (appPort c) . debugHandle (logHandle logger)
-    flushLogger logger
-
-    where
-        logHandle logger msg = logLazyText logger msg >> flushLogger logger
-#endif
-
-data ArgConfig = ArgConfig
-    { environment :: String
-    , port        :: Int
-    } deriving (Show, Data, Typeable)
-
-argConfig :: ArgConfig
-argConfig = ArgConfig
-    { environment = def 
-        &= help ("application environment, one of: " ++ (foldl1 (\a b -> a ++ ", " ++ b) environments))
-        &= typ "ENVIRONMENT"
-    , port = def
-        &= typ "PORT"
-    }
-
-environments :: [String]
-environments = map ((map toLower) . show) ([minBound..maxBound] :: [AppEnvironment])
-
--- | retrieve the -e environment option
-getAppEnv :: ArgConfig -> IO AppEnvironment
-getAppEnv cfg = do
-    let e = if environment cfg /= ""
-            then environment cfg
-            else
-#if PRODUCTION
-                "production"
-#else
-                "development"
-#endif
-    return $ read $ capitalize e
-
-    where
-        capitalize [] = []
-        capitalize (x:xs) = toUpper x : map toLower xs
+main = defaultMain fromArgs with~sitearg~
diff --git a/yesod/scaffold/messages/en.msg.cg b/yesod/scaffold/messages/en.msg.cg
new file mode 100644
index 00000000..e928c34b
--- /dev/null
+++ b/yesod/scaffold/messages/en.msg.cg
@@ -0,0 +1 @@
+Hello: Hello
diff --git a/yesod/scaffold/mongoDBConnPool.cg b/yesod/scaffold/mongoDBConnPool.cg
index 57cb2aa0..4269f2fa 100644
--- a/yesod/scaffold/mongoDBConnPool.cg
+++ b/yesod/scaffold/mongoDBConnPool.cg
@@ -1,16 +1,8 @@
 runConnectionPool :: MonadControlIO m => Action m a -> ConnectionPool -> m a
 runConnectionPool = runMongoDBConn (ConfirmWrites [u"j" =: True])
 
-withConnectionPool :: (MonadControlIO m, Applicative m) => AppConfig -> (ConnectionPool -> m b) -> m b
+withConnectionPool :: (MonadControlIO m, Applicative m) => AppConfig DefaultEnv -> (ConnectionPool -> m b) -> m b
 withConnectionPool conf f = do
-    (database,host) <- liftIO $ loadConnParams (appEnv conf)
-    withMongoDBPool (u database) host (connectionPoolSize conf) f
-  where
-    -- | The database connection parameters.
-    --  loadConnParams :: AppEnvironment -> IO (Database, HostName)
-    loadConnParams env = do
-        allSettings <- (join $ YAML.decodeFile ("config/mongoDB.yml" :: String)) >>= fromMapping
-        settings <- lookupMapping (show env) allSettings
-        database <- lookupScalar "database" settings
-        host <- lookupScalar "host" settings
-        return (database, host)
+    dbConf <- liftIO $ loadMongo (appEnv conf)
+    withMongoDBPool (u $ mgDatabase dbConf) (mgHost dbConf) (mgPoolSize dbConf) f
+
diff --git a/yesod/scaffold/postgresqlConnPool.cg b/yesod/scaffold/postgresqlConnPool.cg
index 9cf1129b..6619a88e 100644
--- a/yesod/scaffold/postgresqlConnPool.cg
+++ b/yesod/scaffold/postgresqlConnPool.cg
@@ -1,23 +1,10 @@
 runConnectionPool :: MonadControlIO m => SqlPersist m a -> ConnectionPool -> m a
 runConnectionPool = runSqlPool
 
-withConnectionPool :: MonadControlIO m => AppConfig -> (ConnectionPool -> m a) -> m a
+withConnectionPool :: MonadControlIO m => AppConfig DefaultEnv -> (ConnectionPool -> m a) -> m a
 withConnectionPool conf f = do
-    cs <- liftIO $ loadConnStr (appEnv conf)
-    with~upper~Pool cs (connectionPoolSize conf) f
-  where
-    -- | The database connection string. The meaning of this string is backend-
-    -- specific.
-    loadConnStr :: AppEnvironment -> IO Text
-    loadConnStr env = do
-        allSettings <- (join $ YAML.decodeFile ("config/~backendLower~.yml" :: String)) >>= fromMapping
-        settings <- lookupMapping (show env) allSettings
-        database <- lookupScalar "database" settings :: IO Text
-
-        connPart <- fmap concat $ (flip mapM) ["user", "password", "host", "port"] $ \key -> do
-          value <- lookupScalar key settings
-          return $ [st| #{key}=#{value} |]
-        return $ [st|#{connPart} dbname=#{database}|]
+    dbConf <- liftIO $ load~upper~ (appEnv conf)
+    with~upper~Pool (pgConnStr dbConf) (pgPoolSize dbConf) f
 
 -- Example of making a dynamic configuration static
 -- use /return $(mkConnStr Production)/ instead of loadConnStr
diff --git a/yesod/scaffold/project.cabal.cg b/yesod/scaffold/project.cabal.cg
index 3109b5ed..3055a7e6 100644
--- a/yesod/scaffold/project.cabal.cg
+++ b/yesod/scaffold/project.cabal.cg
@@ -37,6 +37,8 @@ library
                      Settings.StaticFiles
                      Handler.Root
 
+    ghc-options:   -Wall -threaded -O0
+
 executable         ~project~
     if flag(devel)
         Buildable: False
@@ -45,7 +47,7 @@ executable         ~project~
         cpp-options:   -DPRODUCTION
         ghc-options:   -Wall -threaded -O2
     else
-        ghc-options:   -Wall -threaded
+        ghc-options:   -Wall -threaded -O0
 
     if os(windows)
         cpp-options: -DWINDOWS
@@ -58,6 +60,7 @@ executable         ~project~
                  , yesod-core
                  , yesod-auth
                  , yesod-static
+                 , yesod-default
                  , blaze-html
                  , yesod-form
                  , mime-mail
diff --git a/yesod/scaffold/sqliteConnPool.cg b/yesod/scaffold/sqliteConnPool.cg
index ba4981f2..56e1ae9d 100644
--- a/yesod/scaffold/sqliteConnPool.cg
+++ b/yesod/scaffold/sqliteConnPool.cg
@@ -1,18 +1,10 @@
 runConnectionPool :: MonadControlIO m => SqlPersist m a -> ConnectionPool -> m a
 runConnectionPool = runSqlPool
 
-withConnectionPool :: MonadControlIO m => AppConfig -> (ConnectionPool -> m a) -> m a
+withConnectionPool :: MonadControlIO m => AppConfig DefaultEnv -> (ConnectionPool -> m a) -> m a
 withConnectionPool conf f = do
-    cs <- liftIO $ loadConnStr (appEnv conf)
-    with~upper~Pool cs (connectionPoolSize conf) f
-  where
-    -- | The database connection string. The meaning of this string is backend-
-    -- specific.
-    loadConnStr :: AppEnvironment -> IO Text
-    loadConnStr env = do
-        allSettings <- (join $ YAML.decodeFile ("config/~backendLower~.yml" :: String)) >>= fromMapping
-        settings <- lookupMapping (show env) allSettings
-        lookupScalar "database" settings
+    dbConf <- liftIO $ load~upper~ (appEnv conf)
+    with~upper~Pool (sqlDatabase dbConf) (sqlPoolSize dbConf) f
 
 -- Example of making a dynamic configuration static
 -- use /return $(mkConnStr Production)/ instead of loadConnStr
diff --git a/yesod/scaffold/tiny/Application.hs.cg b/yesod/scaffold/tiny/Application.hs.cg
index 99e4d7f9..0bd1d218 100644
--- a/yesod/scaffold/tiny/Application.hs.cg
+++ b/yesod/scaffold/tiny/Application.hs.cg
@@ -11,11 +11,12 @@ module Application
 import Foundation
 import Settings
 import Yesod.Static
-import Yesod.Logger (makeLogger, flushLogger, Logger, logLazyText, logString)
+import Yesod.Default.Config
+import Yesod.Default.Main (defaultDevelApp)
+import Yesod.Logger (Logger)
 import Data.ByteString (ByteString)
 import Network.Wai (Application)
 import Data.Dynamic (Dynamic, toDyn)
-import Network.Wai.Middleware.Debug (debugHandle)
 
 -- Import all relevant handler modules here.
 import Handler.Root
@@ -37,7 +38,7 @@ getRobotsR = return $ RepPlain $ toContent ("User-agent: *" :: ByteString)
 -- performs initialization and creates a WAI application. This is also the
 -- place to put your migrate statements to have automatic database
 -- migrations handled by Yesod.
-with~sitearg~ :: AppConfig -> Logger -> (Application -> IO a) -> IO a
+with~sitearg~ :: AppConfig DefaultEnv -> Logger -> (Application -> IO a) -> IO a
 with~sitearg~ conf logger f = do
 #ifdef PRODUCTION
     s <- static Settings.staticDir
@@ -49,16 +50,4 @@ with~sitearg~ conf logger f = do
 
 -- for yesod devel
 withDevelAppPort :: Dynamic
-withDevelAppPort =
-    toDyn go
-  where
-    go :: ((Int, Application) -> IO ()) -> IO ()
-    go f = do
-        conf <- Settings.loadConfig Settings.Development
-        let port = appPort conf
-        logger <- makeLogger
-        logString logger $ "Devel application launched, listening on port " ++ show port
-        with~sitearg~ conf logger $ \app -> f (port, debugHandle (logHandle logger) app)
-        flushLogger logger
-      where
-        logHandle logger msg = logLazyText logger msg >> flushLogger logger
+withDevelAppPort = toDyn $ defaultDevelApp with~sitearg~
diff --git a/yesod/scaffold/tiny/Foundation.hs.cg b/yesod/scaffold/tiny/Foundation.hs.cg
index 72993157..ca02521b 100644
--- a/yesod/scaffold/tiny/Foundation.hs.cg
+++ b/yesod/scaffold/tiny/Foundation.hs.cg
@@ -1,8 +1,9 @@
 {-# LANGUAGE QuasiQuotes, TemplateHaskell, TypeFamilies #-}
-{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE OverloadedStrings, MultiParamTypeClasses #-}
 module Foundation
     ( ~sitearg~ (..)
     , ~sitearg~Route (..)
+    , ~sitearg~Message (..)
     , resources~sitearg~
     , Handler
     , Widget
@@ -14,17 +15,15 @@ module Foundation
     ) where
 
 import Yesod.Core
+import Yesod.Default.Config
+import Yesod.Default.Util (addStaticContentExternal)
 import Yesod.Static (Static, base64md5, StaticRoute(..))
 import Settings.StaticFiles
 import Yesod.Logger (Logger, logLazyText)
 import qualified Settings
-import System.Directory
-import qualified Data.ByteString.Lazy as L
 import Settings (hamletFile, cassiusFile, luciusFile, juliusFile, widgetFile)
-import Control.Monad (unless)
 import Control.Monad.Trans.Class (lift)
 import Control.Monad.IO.Class (liftIO)
-import qualified Data.Text as T
 import Web.ClientSession (getKey)
 
 -- | The site argument for your application. This can be a good place to
@@ -32,11 +31,14 @@ import Web.ClientSession (getKey)
 -- starts running, such as database connections. Every handler will have
 -- access to the data present here.
 data ~sitearg~ = ~sitearg~
-    { settings :: Settings.AppConfig
+    { settings :: AppConfig DefaultEnv
     , getLogger :: Logger
     , getStatic :: Static -- ^ Settings for static file serving.
     }
 
+-- Set up i18n messages. See the message folder.
+mkMessage "~sitearg~" "messages" "en"
+
 -- This is where we define all of the routes in our application. For a full
 -- explanation of the syntax, please see:
 -- http://docs.yesodweb.com/book/web-routes-quasi/
@@ -61,7 +63,7 @@ mkYesodData "~sitearg~" $(parseRoutesFile "config/routes")
 -- Please see the documentation for the Yesod typeclass. There are a number
 -- of settings which can be configured by overriding methods here.
 instance Yesod ~sitearg~ where
-    approot = Settings.appRoot . settings
+    approot = appRoot . settings
 
     -- Place the session key file in the config folder
     encryptKey _ = fmap Just $ getKey "config/client_session_key.aes"
@@ -70,7 +72,8 @@ instance Yesod ~sitearg~ where
         mmsg <- getMessage
         pc <- widgetToPageContent $ do
             widget
-            addCassius $(cassiusFile "default-layout")
+            toWidget $(luciusFile "normalize")
+            toWidget $(luciusFile "default-layout")
         hamletToRepHtml $(hamletFile "default-layout")
 
     -- This is done to provide an optimization for serving static files from
@@ -86,11 +89,4 @@ instance Yesod ~sitearg~ where
     -- and names them based on a hash of their content. This allows
     -- expiration dates to be set far in the future without worry of
     -- users receiving stale content.
-    addStaticContent ext' _ content = do
-        let fn = base64md5 content ++ '.' : T.unpack ext'
-        let statictmp = Settings.staticDir ++ "/tmp/"
-        liftIO $ createDirectoryIfMissing True statictmp
-        let fn' = statictmp ++ fn
-        exists <- liftIO $ doesFileExist fn'
-        unless exists $ liftIO $ L.writeFile fn' content
-        return $ Just $ Right (StaticR $ StaticRoute ["tmp", T.pack fn] [], [])
+    addStaticContent = addStaticContentExternal (const $ Left ()) base64md5 Settings.staticDir (StaticR . flip StaticRoute [])
diff --git a/yesod/scaffold/tiny/Handler/Root.hs.cg b/yesod/scaffold/tiny/Handler/Root.hs.cg
deleted file mode 100644
index e485b7cd..00000000
--- a/yesod/scaffold/tiny/Handler/Root.hs.cg
+++ /dev/null
@@ -1,18 +0,0 @@
-{-# LANGUAGE TemplateHaskell, QuasiQuotes, OverloadedStrings #-}
-module Handler.Root where
-
-import Foundation
-
--- This is a handler function for the GET request method on the RootR
--- resource pattern. All of your resource patterns are defined in
--- config/routes
---
--- The majority of the code you will write in Yesod lives in these handler
--- functions. You can spread them across multiple files if you are so
--- inclined, or create a single monolithic file.
-getRootR :: Handler RepHtml
-getRootR = do
-    defaultLayout $ do
-        h2id <- lift newIdent
-        setTitle "~project~ homepage"
-        addWidget $(widgetFile "homepage")
diff --git a/yesod/scaffold/tiny/Settings.hs.cg b/yesod/scaffold/tiny/Settings.hs.cg
index bec5d248..605bc709 100644
--- a/yesod/scaffold/tiny/Settings.hs.cg
+++ b/yesod/scaffold/tiny/Settings.hs.cg
@@ -14,9 +14,6 @@ module Settings
     , widgetFile
     , staticRoot
     , staticDir
-    , loadConfig
-    , AppEnvironment(..)
-    , AppConfig(..)
     ) where
 
 import qualified Text.Hamlet as S
@@ -27,60 +24,10 @@ import qualified Text.Shakespeare.Text as S
 import Text.Shakespeare.Text (st)
 import Language.Haskell.TH.Syntax
 import Yesod.Widget (addWidget, addCassius, addJulius, addLucius, whamletFile)
+import Yesod.Default.Config
 import Data.Monoid (mempty)
 import System.Directory (doesFileExist)
-~settingsTextImport~
-import Data.Object
-import qualified Data.Object.Yaml as YAML
-import Control.Monad (join)
-
-data AppEnvironment = Test
-                    | Development
-                    | Staging
-                    | Production
-                    deriving (Eq, Show, Read, Enum, Bounded)
-
--- | Dynamic per-environment configuration loaded from the YAML file Settings.yaml.
--- Use dynamic settings to avoid the need to re-compile the application (between staging and production environments).
---
--- By convention these settings should be overwritten by any command line arguments.
--- See config/~sitearg~.hs for command line arguments
--- Command line arguments provide some convenience but are also required for hosting situations where a setting is read from the environment (appPort on Heroku).
---
-data AppConfig = AppConfig {
-    appEnv :: AppEnvironment
-
-  , appPort :: Int
-
-    -- | The base URL for your application. This will usually be different for
-    -- development and production. Yesod automatically constructs URLs for you,
-    -- so this value must be accurate to create valid links.
-    -- Please note that there is no trailing slash.
-    --
-    -- You probably want to change this! If your domain name was "yesod.com",
-    -- you would probably want it to be:
-    -- > "http://yesod.com"
-  , appRoot :: Text
-} deriving (Show)
-
-loadConfig :: AppEnvironment -> IO AppConfig
-loadConfig env = do
-    allSettings <- (join $ YAML.decodeFile ("config/settings.yml" :: String)) >>= fromMapping
-    settings <- lookupMapping (show env) allSettings
-    hostS <- lookupScalar "host" settings
-    port <- fmap read $ lookupScalar "port" settings
-    return $ AppConfig {
-      appEnv = env
-    , appPort = port
-    , appRoot = pack $ hostS ++ addPort port
-    }
-    where
-        addPort :: Int -> String
-#ifdef PRODUCTION
-        addPort _ = ""
-#else
-        addPort p = ":" ++ (show p)
-#endif
+import Data.Text (Text)
 
 -- | The location of static files on your system. This is a file system
 -- path. The default value works properly with your scaffolded site.
@@ -100,7 +47,7 @@ staticDir = "static"
 -- have to make a corresponding change here.
 --
 -- To see how this value is used, see urlRenderOverride in ~project~.hs
-staticRoot :: AppConfig ->  Text
+staticRoot :: AppConfig DefaultEnv ->  Text
 staticRoot conf = [st|#{appRoot conf}/static|]
 
 -- The rest of this file contains settings which rarely need changing by a
diff --git a/yesod/scaffold/tiny/hamlet/homepage.hamlet.cg b/yesod/scaffold/tiny/hamlet/homepage.hamlet.cg
deleted file mode 100644
index 34432b74..00000000
--- a/yesod/scaffold/tiny/hamlet/homepage.hamlet.cg
+++ /dev/null
@@ -1,2 +0,0 @@
-<h1>Hello
-<h2 ##{h2id}>You do not have Javascript enabled.
diff --git a/yesod/scaffold/tiny/project.cabal.cg b/yesod/scaffold/tiny/project.cabal.cg
index 527f265b..1cc7fb75 100644
--- a/yesod/scaffold/tiny/project.cabal.cg
+++ b/yesod/scaffold/tiny/project.cabal.cg
@@ -48,6 +48,7 @@ executable         ~project~
     build-depends: base         >= 4       && < 5
                  , yesod-core   >= 0.9     && < 0.10
                  , yesod-static
+                 , yesod-default
                  , clientsession
                  , wai-extra
                  , directory
diff --git a/yesod/yesod.cabal b/yesod/yesod.cabal
index 9b13dcdf..ef65d087 100644
--- a/yesod/yesod.cabal
+++ b/yesod/yesod.cabal
@@ -17,8 +17,8 @@ homepage:        http://www.yesodweb.com/
 
 extra-source-files:
   input/*.cg
-  scaffold/cassius/default-layout.cassius.cg
-  scaffold/cassius/homepage.cassius.cg
+  scaffold/lucius/default-layout.lucius.cg
+  scaffold/lucius/homepage.lucius.cg
   scaffold/Model.hs.cg
   scaffold/Foundation.hs.cg
   scaffold/LICENSE.cg
@@ -26,11 +26,9 @@ extra-source-files:
   scaffold/tiny/Foundation.hs.cg
   scaffold/tiny/project.cabal.cg
   scaffold/tiny/Application.hs.cg
-  scaffold/tiny/hamlet/homepage.hamlet.cg
-  scaffold/tiny/Handler/Root.hs.cg
   scaffold/tiny/config/routes.cg
   scaffold/tiny/Settings.hs.cg
-  scaffold/static/css/normalize.css.cg
+  scaffold/lucius/normalize.lucius.cg
   scaffold/postgresqlConnPool.cg
   scaffold/sqliteConnPool.cg
   scaffold/.ghci.cg
@@ -52,6 +50,7 @@ extra-source-files:
   scaffold/config/routes.cg
   scaffold/Settings.hs.cg
   scaffold/Settings/StaticFiles.hs.cg
+  scaffold/messages/en.msg.cg
 
 
 flag ghc7