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darcs get http://www.cs.york.ac.uk/fp/darcs/hoogle
Haddock generated documentation is available here.
Contributions are most welcome. Hoogle is written in Haskell 98 + Heirarchical Modules, I do not wish to change this. Other than that, I'm pretty flexible about most aspects of Hoogle. Some projects could be easily embarked upon are profiling, writing test frameworks and new front ends. Contact me if you have thoughts on doing something to Hoogle.
A wiki with the current development status, including bugs and things todo is at http://www.haskell.org/hawiki/Hoogle.