From Fedora Project Wiki
Haskell
The Fedora Haskell SIG has been busy updating Haskell packages and our Packaging Guidelines. The new guidelines and cabal2spec now make it very easy to package Haskell Cabal packages for Fedora.
For Fedora 11 the various packages have been updated to new versions including ghc-6.10.1, darcs-2.2.1, and ghc-gtk2hs-0.10.0. Newly added packages include cabal-install, cpphs, ghc-HTTP, ghc-paths, ghc-zlib.
There is also a new #fedora-haskell IRC channel on Freenode for discussion.