http://live.pirillo.com/ – Beryl is, by far, one of the best 3D desktop managers, period. Of course, setting up and configuring Beryl can be somewhat complicated. Thankfully, there's Sabayon Linux, a free Live CD distribution of Linux.
As a Live CD distribution, Sabayon never touches your hard drive so you don't have to worry about losing data, hard drive formatting, and other issues that come about from switching operating systems. Of course, you could always install Sabayon on your machine and not worry about booting from a CD.
What's really cool about Sabayon is that it comes with all of the drivers and software installed and configured so you don't have to mess around with any configuration files to get the beautiful Beryl desktop to work.
What is your favorite desktop manager?
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