Haskell
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It's a standing joke in the Haskell community that every Haskell programmer, as part of his or her learning process, will eventually write one or more monad tutorials.
Mike's World-O-Programming - Yet Another Monad Tutorial (part 1: basics)
Why Do Monads Matter? « Sententia cdsmithus
( A Side Note: I’ve been formulating the final thoughts on this post for about a week now. In an entirely unrelated coincidence, a good friend of mine and fellow Haskell programmer, Doug Beardsley, ended up writing two posts about monads over the weekend as well. Weird!
Haskell/Category theory
This article attempts to give an overview of category theory, in so far as it applies to Haskell.
