haskell@gentoo.org Gentoo Haskell MemoTrie provides a basis for memoized functions over some domains, using tries. It's based on some code I got from Spencer Janssen. Project wiki page: <http://haskell.org/haskellwiki/MemoTrie> &#169; 2008,2009,2010 by Conal Elliott; BSD3 license. conal/MemoTrie