Holy cow. With Apple's Boot Camp (which is in public beta now) you can dual boot both OSX and Windows on an Intel-based Mac.
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.
Bootcamp's a free download for Mac.