When it comes to virtualising Linux, VMWare has always had the edge of Microsoft’s Virtual PC which has limited video display support. Although these were the best two, there have been other lesser-known options like XENSource. Here’s Sun’s VirtualBox and why it is truly kick-ass.
You know what virtualisation is; it lets you run – on one physical computer – multiple, separate, computer environments. Each environment behaves as if it is genuinely running on real hardware directly. Virtualisation lets you run an operating system with all its bits and pieces on top of your existing operating system.
http://www.linuxlinks.com/portal/news/article.php?story=20080811140610390