dpiponi:

I was just putting together my Amazon wish list and was wondering if there are any great books on Haskell and/or functional programming that people think are must-reads. Okasaki's "Purely Functional Programming", Pierce's "Types and Programming Languages" are frequent recommendations. Smullyan's "To Mock a Mockingbird" seems like it might be a good example from the lighter end. Are there any other classics I should know about?

http://www.labri.fr/perso/casteran/CoqArt/index.html Is on my wishlist :) You might find some other things here, http://haskell.org/haskellwiki/Books_and_tutorials#Textbooks -- Don

Richard Bird's "Introduction to Functional Programming using Haskell, second edition" exceeds other introductory books by introducing laws (e.g., fold laws, fusion laws), efficiency issues (including the stack overflow question, deforestation), and monad transformers. IMO these are under-represented and greatly FUDed topics.