I've been hacking away at this syntax file lately, in the hopes that Textmate will wind up actually usable for Haskell.
For comparison purposes I've made screenshots of the old and new grammars' highlighting capabilities.
Before: http://www.rsmw.net/ergo/textmate_haskell1.png After: http://www.rsmw.net/ergo/textmate_haskell2.png
(I sent this e-mail once already to bundles@<...>, but was told to re-send it here.)