Haskell Reference at Zvon: A thoroughly indexed reference to Haskell syntax and libraries with many examples.
Haskell Tutorial: An introduction to Haskell, including explanation of basic concepts and exercises. [Postcript]
Haskell Tutorial: A tutorial on Haskell from Walla Walla College
Haskell: The Craft of Functional Programming: By Simon Thompson; Addison-Wesley, 1999, ISBN 0201342758. Edition 2, introductory textbook to functional programming in Haskell. [University of Kent]
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.
The Lambda Complex: A tutorial site for Haskell aimed at programmers used to imperative languages (such as C).
