diff --git a/Data/Semigroupoid/Coproduct.hs b/Data/Semigroupoid/Coproduct.hs
new file mode 100644
--- /dev/null
+++ b/Data/Semigroupoid/Coproduct.hs
@@ -0,0 +1,17 @@
+{-# LANGUAGE GADTs, EmptyDataDecls #-}
+module Data.Semigroupoid.Coproduct 
+  ( L, R, Coproduct(..) ) where
+
+import Data.Semigroupoid
+
+data L a
+data R a
+
+data Coproduct j k a b where
+  L :: j a b -> Coproduct j k (L a) (L b)
+  R :: k a b -> Coproduct j k (R a) (R b)
+
+instance (Semigroupoid j, Semigroupoid k) => Semigroupoid (Coproduct j k) where
+  L f `o` L g = L (f `o` g)
+  R f `o` R g = R (f `o` g)
+  _ `o` _ = error "GADT fail"
diff --git a/Data/Semigroupoid/Product.hs b/Data/Semigroupoid/Product.hs
new file mode 100644
--- /dev/null
+++ b/Data/Semigroupoid/Product.hs
@@ -0,0 +1,10 @@
+{-# LANGUAGE GADTs #-}
+module Data.Semigroupoid.Product where
+
+import Data.Semigroupoid
+
+data Product j k a b where
+  Pair :: j a b -> k a' b' -> Product j k (a,a') (b,b')
+
+instance (Semigroupoid j, Semigroupoid k) => Semigroupoid (Product j k) where
+  Pair w x `o` Pair y z = Pair (w `o` y) (x `o` z)
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright 2011 Edward Kmett
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. 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.
+
+3. Neither the name of the author nor the names of his contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHORS 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.lhs b/Setup.lhs
new file mode 100644
--- /dev/null
+++ b/Setup.lhs
@@ -0,0 +1,7 @@
+#!/usr/bin/runhaskell
+> module Main (main) where
+
+> import Distribution.Simple
+
+> main :: IO ()
+> main = defaultMain
diff --git a/semigroupoid-extras.cabal b/semigroupoid-extras.cabal
new file mode 100644
--- /dev/null
+++ b/semigroupoid-extras.cabal
@@ -0,0 +1,29 @@
+name:          semigroupoid-extras
+category:      Control
+version:       0.1
+license:       BSD3
+cabal-version: >= 1.6
+license-file:  LICENSE
+author:        Edward A. Kmett
+maintainer:    Edward A. Kmett <ekmett@gmail.com>
+stability:     provisional
+homepage:      http://github.com/ekmett/semigroupoid-extras
+copyright:     Copyright (C) 2011 Edward A. Kmett
+build-type:    Simple
+synopsis:      semigroupoid products and coproducts
+description:   semigroupoid products and coproducts
+
+source-repository head
+  type: git
+  location: git://github.com/ekmett/semigroupoid-extras.git
+
+library
+  build-depends: 
+    base >= 4 && < 4.4,
+    semigroupoids >= 1.1 && < 1.2
+
+  exposed-modules:
+    Data.Semigroupoid.Product
+    Data.Semigroupoid.Coproduct
+
+  ghc-options: -Wall