The latest Red Hat Magazine has a nice article on The virtues of Xen. This is something that's already on my TODO list.... I have a spare system (or virtual machine) I can throw Fedora Core 4 on (which has Xen built in). This article nicely explains why this is cool...
Red Hat has announced it will push for Xen integration in the Linux kernel, and that virtualization and stateless Linux is the way to go. Hooray! But wait--what's the buzz all about? What's so special about virtualization anyway?
More information on this is available at the Fedora Xen quickstart wiki page.