Just realized I never blogged VirtualBox as its own item. Open source OS virtualization tool. Right now, I have it running on my Mac with both Ubuntu and Windows XP ready to go.
Very stable. Easy to install the guest OS’s. Win XP install broke at one point, but it also did in Parallels.
One nice feature, which should be automated, is the sharing of input devices. This requires a special, but easy, process - http://seogadget.co.uk/how-to-install-virtualbox-guest-additions/