I know when I have to switch machines again, I'll be going for a no-OS option, slapping on whatever the *nix flavor of the month is, and from there, loading win7 or xp in virtualbox. I don't want a fancier, more beautiful OS, I want an "It simply works " {TM} OS. Nice thing with Virtual machines is that I have them set up for each task, so it's a minimal install with what's needed, on drive or folder mapped to my physical drive to save files, a virtual drive for the OS and programs that reverts to it's known good config every time it boots, plus if I fark it, I can just copy it back from a DVD, and be ready to work again.
The only physical machine install I maintain is win2k on a PII, to run the controler software for my CNC mill. every other machine I own is a barebones install that runs virtual machines, so there is no more Crap, the motherboard dies, and now I need to find a full day to do a full install on a new machine! moments. Just open the box, download VMWARE, and copy whatever VM's I need onto the HDD.
"Live or die, I'll make a million." -- Reebus Kneebus, before his jump to the center of the earth, Firesign Theater