Haskell
Here are some good sources:
- Programming in Haskell by Graham Hutton. This is an excellent, step-by-step introduction to Haskell. Graham also has a lot of online resources (slides, videos, etc.) to go along with the book.
- Learn You a Haskell for Good by Miran Lipovaca. Highly amusing and informative; available here.
- A Gentle Introduction to Haskell by Hudak, Peterson, and Fasal. Available at http://www.haskell.org/tutorial/.
- Real World Haskell by Bryan O'Sullivan. Also available online (I believe).
- Google.
- Haskell for Grownups. These are some slides (HaskellForGrownups.pdf) I've presented here and there over the years as a quick intro to Haskell and what all the fuss is about.