diff --git a/Data/Configuration.hs b/Data/Configuration.hs
new file mode 100644
--- /dev/null
+++ b/Data/Configuration.hs
@@ -0,0 +1,32 @@
+{-# LANGUAGE StandaloneDeriving, DeriveDataTypeable #-}
+module Data.Configuration ( Conf, as, valueForKey, (<@>), keys
+                          , (!), toConf, toDyn, toMap) where
+import Data.Map hiding ((!), keys)
+import qualified Data.Map as M
+import Data.Dynamic
+import Prelude hiding (lookup)
+import Control.Applicative
+import Data.Maybe
+import Data.Data
+
+newtype Conf = Conf { toMap :: Map String Dynamic } deriving (Typeable)
+toConf :: [(String, Dynamic)] -> Conf
+toConf = Conf . fromList
+
+as :: a
+as = undefined
+
+keys :: Conf -> [String]
+keys = M.keys . toMap
+
+valueForKey :: Typeable a => String -> Conf -> a -> Maybe a
+valueForKey key conf _ = fromDynamic =<< lookup key (toMap conf)
+
+(!) :: Typeable a => Conf -> String -> a
+conf ! key = case valueForKey key conf undefined of
+               Just val -> val
+               Nothing  -> error $ "no such key: " ++ key
+
+(<@>) :: Typeable a => String -> a -> (String, Dynamic)
+key <@> val = (key, toDyn val)
+
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright (c)2011, Hiromi ISHII
+
+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.
+
+    * Neither the name of Hiromi ISHII nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"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
+OWNER OR CONTRIBUTORS 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/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/configuration.cabal b/configuration.cabal
new file mode 100644
--- /dev/null
+++ b/configuration.cabal
@@ -0,0 +1,59 @@
+-- configuration.cabal auto-generated by cabal init. For additional
+-- options, see
+-- http://www.haskell.org/cabal/release/cabal-latest/doc/users-guide/authors.html#pkg-descr.
+-- The name of the package.
+Name:                configuration
+
+-- The package version. See the Haskell package versioning policy
+-- (http://www.haskell.org/haskellwiki/Package_versioning_policy) for
+-- standards guiding when and how versions should be incremented.
+Version:             0.1
+
+-- A short (one-line) description of the package.
+Synopsis:            Simple data type for application configuration.
+
+-- A longer description of the package.
+Description:         Simple data type to store Typeable values.
+
+-- The license under which the package is released.
+License:             BSD3
+
+-- The file containing the license text.
+License-file:        LICENSE
+
+-- The package author(s).
+Author:              Hiromi ISHII
+
+-- An email address to which users can send suggestions, bug reports,
+-- and patches.
+Maintainer:          konn.jinro_at_gmail.com
+
+-- A copyright notice.
+Copyright:           (c) Hiromi ISHII 2011
+
+Category:            Data
+
+Build-type:          Simple
+
+-- Extra files to be distributed with the package, such as examples or
+-- a README.
+-- Extra-source-files:  
+
+-- Constraint on the version of Cabal needed to build this package.
+Cabal-version:       >=1.2
+
+
+Library
+  -- Modules exported by the library.
+  Exposed-modules:     Data.Configuration
+  
+  -- Packages needed in order to build this package.
+  Build-depends: base       >= 4.0 && < 5
+               , containers >= 0.3 && < 0.5
+  
+  -- Modules not exported by this package.
+  -- Other-modules:       
+  
+  -- Extra tools (e.g. alex, hsc2hs, ...) needed to build the source.
+  -- Build-tools:         
+