3D Desktops on Linux

Do you have any experience with 3D desktop. It's very nice and it makes new path to new generation.
visit following sites to get news about that

good articale here

http://www.atomicmpc.com.au/article.asp?SCID=22&CIID=35615

good manual pages here <<>>
http://www.gentoo-wiki.com/XGL

download from soruceforge
http://prdownloads.sourceforge.net/desk3d/3ddesktop-0.2.9.tar.gz?download