Learn You a Haskell for Great Good! (2011)
This guide is meant for people who have programmed already, but have yet to try functional programming.
The whole thing is completely free to read online, but it's also available in print and I encourage you to buy as many copies as you can afford!
To contact me, shoot me an email to: bonus at learnyouahaskell dot com! You can also find me idling on #haskell where I go by the name BONUS.
Added by: learnawesome