If you haven't seen and experienced Xgl graphics yet, and you have a supported 3D card, you owe yourself the treat of downloading the Karoraa Live CD and giving it a whirl. It beats any platform desktop graphics, bar none
http://os.newsforge.com/article.pl?sid=06/03/14/1557211
http://os.newsforge.com/article.pl?sid=06/03/14/1557211