Suggested sources for learning Haskell:
- RealWorldHaskell - an online beta of the O'Reilly book, free to read and free to add comments
- Also available as a physical book as well.
- VitalHaskell - a very cool multimedia Haskell running over a jvm.
- HappsFramework - a web app construction kit entirely in Haskell.
- If you can program anything in HappS you actually already learned Haskell.
- http://www.zvon.org/other/haskell/Outputglobal/index.html is a nice online reference
- Once you start working with the language you'll need to learn DarcsRevisionControl and HackageHoogleCabal
- LearnYouaHaskellForGreatGood is a brilliant introduction to Haskell for total newbies.
- And for more there is the great Haskell Wikibook.
What else?
See HaskellLanguage