Sandy recommended Haskell From First Principles. 3 months ago
Learn Haskell Fast and Hard
From very beginner up to Monads in a very short and dense tutorial.
Learn You a Haskell for Great Good!
Learn You a Haskell for Great Good! is a witty and entertaining tutorial style introduction to Haskell. It takes a while to get the hang of functional programming, even if you&...
Real World Haskell
It goes over advanced stuff like monad transformers, concurrency and profiling. I hope there is someday an even more advanced book, but so far this is the one.