Here are a couple of links for anyone who wants to get started using Haskell. These are both interpreter implementations of the language but are good for getting started.
Hugs 98 is a functional programming system based on Haskell 98, the de facto standard for non-strict functional programming languages. Hugs 98 provides an almost complete implementation of Haskell 98.
WinHugs is the Windows user interface to Hugs. In addition to all of the Hugs features, it includes type browsers and heirarchical constraint views. WinHugs should run on any version of Windows since 95, i.e. 95/98/ME/NT/2K/XP.