Next Linux Desktop Rivals Mac OS X in Eye Candy
Take a look at what the next generation of Linux desktop looks like on this Linux video.
It uses Compiz and XGL to create a desktop interface that rivals or surpasses the slick look of Mac OS X. Notice the special effects when moving the windows around, and especially the desktop-switching feature, where you can switch between four virtual desktops by spinning them around like they are faces on a cube.
If you want to take Compiz/XGL for a trial run on your own computer you can try the Kororaa live CD. I found it to be a little buggy because it is still in an early version (0.2), but it is very impressive if your computer has the specs to run it.