diff --git a/Data/Set/Extra.hs b/Data/Set/Extra.hs
--- a/Data/Set/Extra.hs
+++ b/Data/Set/Extra.hs
@@ -1,24 +1,26 @@
 module Data.Set.Extra
     ( module Data.Set
-    , catMaybes 
-    , flatten
-    , concatMap
     , mapM
+    , mapM_
     , filterM
+    , catMaybes
+    , mapMaybe
+    , flatten
+    , concatMap
     , concatMapM
     , any
     , all
-    , distrib
     , or
     , and
     , ss
-    , ssMapM
     , toSS
     , fromSS
+    , ssMapM
+    , distrib
     , cartesianProduct
-    -- , anyM
     , groupBy
     , partitionM
+    , unzip
     , gFind
     ) where
 
@@ -35,12 +37,18 @@
 mapM :: (Monad m, Ord b) => (a -> m b) -> Set a -> m (Set b)
 mapM f s = List.mapM f (toList s) >>= return . fromList
 
+mapM_ :: (Monad m, Ord b) => (a -> m b) -> Set a -> m ()
+mapM_ f s = List.mapM_ f (toList s)
+
 filterM :: (Ord a, Monad m) => (a -> m Bool) -> Set a -> m (Set a)
 filterM p s = List.filterM p (toList s) >>= return . fromList
 
 catMaybes :: Ord a => Set (Maybe a) -> Set a
 catMaybes sm = fold (\ mx s -> maybe s (`insert` s) mx) empty sm
 
+mapMaybe :: (a -> Maybe b) -> Set a -> Set b
+mapMaybe f s = catMaybes (Data.Set.map f s)
+
 flatten :: Ord a => Set (Set a) -> Set a
 flatten ss' = fold union empty ss'
 --flatten = unions . toList
@@ -99,3 +107,6 @@
 partitionM p xs =
     List.foldM f (empty, empty) (toList xs)
     where f (ts, fs) x = p x >>= \ flag -> return $ if flag then (insert x ts, fs) else (ts, insert x fs)
+
+unzip :: Set (a, b) -> (Set a, Set b)
+unzip s = fold (\ (l, r) (ls, rs) -> (Set.insert l ls, Set.insert r rs))
diff --git a/debian/changelog b/debian/changelog
deleted file mode 100644
--- a/debian/changelog
+++ /dev/null
@@ -1,18 +0,0 @@
-haskell-set-extra (1.2) unstable; urgency=low
-
-  * Fix gFind.
-
- -- David Fox <dsf@seereason.com>  Wed, 24 Aug 2011 22:29:50 -0700
-
-haskell-set-extra (1.1) unstable; urgency=low
-
-  * Add gFind for sets.
-
- -- David Fox <dsf@seereason.com>  Wed, 24 Aug 2011 13:16:35 -0700
-
-haskell-set-extra (1.0-1~hackage1) unstable; urgency=low
-
-  * Debianization generated by cabal-debian
-
- -- David Fox <dsf@seereason.com>  Wed, 24 Aug 2011 10:26:35 -0700
-
diff --git a/debian/compat b/debian/compat
deleted file mode 100644
--- a/debian/compat
+++ /dev/null
@@ -1,1 +0,0 @@
-7
diff --git a/debian/control b/debian/control
deleted file mode 100644
--- a/debian/control
+++ /dev/null
@@ -1,62 +0,0 @@
-Source: haskell-set-extra
-Priority: extra
-Section: haskell
-Maintainer: David Fox <dsf@seereason.com>
-Build-Depends: debhelper (>= 7.0),
-               haskell-devscripts (>= 0.8),
-               cdbs,
-               ghc,
-               ghc-prof,
-               libghc-mtl-prof,
-               libghc-syb-prof
-Build-Depends-Indep: ghc-doc,
-                     libghc-mtl-doc,
-                     libghc-syb-doc
-Standards-Version: 3.9.1
-Homepage: http://src.seereason.com/set-extra
-
-Package: libghc-set-extra-dev
-Architecture: any
-Depends: ${shlibs:Depends},
-         ${haskell:Depends},
-         ${misc:Depends}
-Recommends: ${haskell:Recommends}
-Suggests: ${haskell:Suggests}
-Provides: ${haskell:Provides}
-Description: Functions that could be added to Data.Set.
- Functions that could be added to Data.Set.
- .
-  Author: David Fox
-  Upstream-Maintainer: David Fox <dsf@seereason.com>
- .
- This package contains the normal library files.
-
-Package: libghc-set-extra-prof
-Architecture: any
-Depends: ${haskell:Depends},
-         ${misc:Depends}
-Recommends: ${haskell:Recommends}
-Suggests: ${haskell:Suggests}
-Provides: ${haskell:Provides}
-Description: Functions that could be added to Data.Set.
- Functions that could be added to Data.Set.
- .
-  Author: David Fox
-  Upstream-Maintainer: David Fox <dsf@seereason.com>
- .
- This package contains the libraries compiled with profiling enabled.
-
-Package: libghc-set-extra-doc
-Architecture: all
-Section: doc
-Depends: ${haskell:Depends},
-         ${misc:Depends}
-Recommends: ${haskell:Recommends}
-Suggests: ${haskell:Suggests}
-Description: Functions that could be added to Data.Set.
- Functions that could be added to Data.Set.
- .
-  Author: David Fox
-  Upstream-Maintainer: David Fox <dsf@seereason.com>
- .
- This package contains the documentation files.
diff --git a/debian/copyright b/debian/copyright
deleted file mode 100644
--- a/debian/copyright
+++ /dev/null
@@ -1,34 +0,0 @@
-This package was cabalized by David Fox
-<dsf@seereason.com> on August 24, 2011.
-
-Copyright (c) 2011, David Fox
-
-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.
-
-    * The names of contributors may not 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/debian/rules b/debian/rules
deleted file mode 100644
--- a/debian/rules
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/usr/bin/make -f
-include /usr/share/cdbs/1/rules/debhelper.mk
-include /usr/share/cdbs/1/class/hlibrary.mk
-
-
-# How to install an extra file into the documentation package
-#binary-fixup/libghc-set-extra-doc::
-#	echo "Some informative text" > debian/libghc-set-extra-doc/usr/share/doc/libghc-set-extra-doc/AnExtraDocFile
diff --git a/set-extra.cabal b/set-extra.cabal
--- a/set-extra.cabal
+++ b/set-extra.cabal
@@ -1,5 +1,5 @@
 Name:           set-extra
-Version:        1.2
+Version:        1.3
 License:        BSD3
 License-File:	COPYING
 Author:         David Fox
