"Wodor has hacked together an anaglyph plugin for Compiz that turns ordinary monitor into a real 3D one. The blurry image you see below is an anaglyph rendered by the plugin, you need 3D glasses or use anything transparent red (left eye) and cyan(right eye) to view the magic."
http://dev.compiz-fusion.org/~cyberorg/2007/11/01/introducing-the-real-3d-compiz/