Haskell Reference at Zvon
   A thoroughly indexed reference to Haskell syntax and libraries with many examples.
   http://zvon.org/other/haskell/Outputglobal/index.html

Haskell Tutorial
   A tutorial on Haskell from Walla Walla College
   http://www.cs.wwc.edu/KU/PR/Haskell.html

Haskell for C Programmers
   A tutorial for people with a background in imperative languagues like C, C++, Java or Python.
   http://www.haskell.org/~pairwise/intro/intro.html

Haskell: The Craft of Functional Programming
   Descriptions, reviews, purchase source. [Amazon.com]
   http://www.amazon.com/exec/obidos/ASIN/0201342758

Monads for the Working Haskell Programmer
   This short tutorial introduces monads to Haskell programmers.
   http://www.engr.mun.ca/~theo/Misc/haskell_and_monads.htm

Online Bibliography of Haskell Research
   Provides a constantly-growing bibliography of papers, and theses, on research related to the Haskell programming language. Links to online copies of each paper are provided, where available.
   http://haskell.readscheme.org/

The Lambda Complex
   A tutorial site for Haskell aimed at programmers used to imperative languages (such as C).
   http://www.haskell.org/complex/