Vista on the Mac
But think about it. We have Boot Camp and we have Parallels, so why put off upgrading to Vista? Being Mac users, it's far less of a risk because we can always retreat back to OS X to get the real work done if the new OS has problems. Virtual machines make it simple to try out different configurations and compartmentalize your work life--as if you owned many different computers at once. Sure, Apple's commercials may visualize "PC" as going to the hospital for major surgery to get his Vista upgrade, but for Mac users, it's as simple as adding a new virtual machine in Parallels.