Haskell.org 
Repository for information on the lazy functional programming language Haskell: Descriptions, documents, history, news, HaWiki, software (libraries, tools), humor, merchandise, and links.
http://www.haskell.org/Hello, World Program
What Hello World in Haskell looks like.
http://www2.latech.edu/~acm/helloworld/haskell.html
Wikipedia: Haskell Programming Language
Online encyclopedia article.
http://en.wikipedia.org/wiki/Haskell_programming_language
Why Haskell?
Why learn Haskell? What is good about the pure functional programming model as exemplified by Haskell? ScienceBlogs LLC; Good Math, Bad Math.
http://scienceblogs.com/goodmath/2006/11/why_haskell.php
Haskell API Search
Search engine for the Haskell standard libraries (Prelude, List, Array, etc). Search by function name, or type signature. Gives examples and overviews of many functions.
http://haskell.org/hoogle/
