XMonad is a tiling window manager written in Haskell for X.

Features :
    * Very stable, fast, small and simple.
    * Automatic window tiling and management
    * First class keyboard support: a mouse is unnecessary
    * Full support for tiling windows on multi-head displays
    * Full support for floating windows
    * XRandR support to rotate, add or remove monitors
    * Per-workspace layout algorithms
    * Per-screens custom status bars
    * Easy, powerful customisation and reconfiguration
    * Large extension library
    * Extensive documentation and support for hacking

WWW:	http://www.xmonad.org/