I do a lot with operating systems. I have Fedora 9, Windows XP, and MacOSX Leopard installed natively on my machine. Under Fedora, I virtualize Windows Vista with VirtualBox and MacOSX Tiger with VMware Server. Most of the work is just to help support some of my pet programming projects, and give me access to the fullest array of software.
Maybe there will be more to come.
--gnubeard