diff --git a/Hack/Middleware/Gzip.hs b/Hack/Middleware/Gzip.hs
new file mode 100644
--- /dev/null
+++ b/Hack/Middleware/Gzip.hs
@@ -0,0 +1,44 @@
+---------------------------------------------------------
+-- |
+-- Module        : Hack.Middleware.Gzip
+-- Copyright     : Michael Snoyman
+-- License       : BSD3
+--
+-- Maintainer    : Michael Snoyman <michael@snoyman.com>
+-- Stability     : Unstable
+-- Portability   : portable
+--
+-- Automatic gzip compression of responses.
+--
+---------------------------------------------------------
+module Hack.Middleware.Gzip (gzip) where
+
+import Hack
+import Codec.Compression.GZip (compress)
+import Data.Maybe (fromMaybe)
+import Data.List.Split (splitOneOf)
+
+-- | Use gzip to compress the body of the response.
+--
+-- Analyzes the \"Accept-Encoding\" header from the client to determine
+-- if gzip is supported.
+--
+-- Possible future enhancements:
+--
+-- * Only compress if the response is above a certain size.
+--
+-- * Add Content-Length.
+--
+-- * I read somewhere that \"the beast\" (MSIE) can\'t support compression
+-- for Javascript files..
+gzip :: Middleware
+gzip app env = do
+    res <- app env
+    let enc = fromMaybe [] $ splitOneOf "," `fmap` lookup "Accept-Encoding"
+              (http env)
+    if "gzip" `elem` enc
+        then return res
+                { body = compress $ body res
+                , headers = ("Content-Encoding", "gzip") : headers res
+                }
+        else return res
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,25 @@
+The following license covers this documentation, and the source code, except
+where otherwise indicated.
+
+Copyright 2008, 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/Setup.lhs b/Setup.lhs
new file mode 100644
--- /dev/null
+++ b/Setup.lhs
@@ -0,0 +1,7 @@
+#!/usr/bin/env runhaskell
+
+> module Main where
+> import Distribution.Simple
+
+> main :: IO ()
+> main = defaultMain
diff --git a/hack-middleware-gzip.cabal b/hack-middleware-gzip.cabal
new file mode 100644
--- /dev/null
+++ b/hack-middleware-gzip.cabal
@@ -0,0 +1,18 @@
+name:            hack-middleware-gzip
+version:         0.0.0
+license:         BSD3
+license-file:    LICENSE
+author:          Michael Snoyman <michael@snoyman.com>
+maintainer:      Michael Snoyman <michael@snoyman.com>
+synopsis:        Automatic gzip compression of responses.
+category:        Web
+stability:       unstable
+cabal-version:   >= 1.2
+build-type:      Simple
+homepage:        http://github.com/snoyberg/hack-middleware-gzip/tree/master
+
+library
+    build-depends:   base >= 3, split >= 0.1.1, zlib >= 0.5,
+                     hack >= 2009.5.19
+    exposed-modules: Hack.Middleware.Gzip
+    ghc-options:     -Wall