More and more people are buying and loving Macs. To make this choice simply irresistible, Apple will include technology in the next major release of Mac OS X, Leopard, that lets you install and run the Windows XP operating system on your Mac. Called Boot Camp (for now), you can download a public beta today.

this one is a officials from Apple! the 83MB Boot Camp is available now for download. but i didn't have any Mac OSX..

p/s: sound like virtual machine too.. but a little bit different ;)