I was always sure that's what Haskell desperately needs: Visual Haskell:
Visual Haskell is a complete development environment for Haskell software, based on Microsoft's Visual Studio platform. Visual Haskell integrates with the Visual Studio editor to provide interactive features to aid Haskell development, and it enables the construction of projects consisting of multiple Haskell modules, using the Cabal building/packaging infrastructure.It's still version 0.0 though.
Don Box said "Scheme Is Love", but he forgot to mention that Scheme is actually Love to Lots of Irritating, Silly Parentheses. Haskell my friends is the Real Love.
[Via Lambda the Ultimate]
Check out eclipsefp - Eclipse plugin for Haskell and Ocaml.