Pixelique

First there's an Intel-based Macs, now officially Apple put another flavours to its Macintosh.
Yes, now they can run both OS X or Windows XP (Service Pack 2) Home or Professional Edition.

What you will need:
Boot Camp requires an Intel-based Mac with a USB keyboard and mouse, or a built-in keyboard and TrackPad; Mac OS X version 10.4.6 or later; the latest firmware update; at least 10GB of free space on the startup disk; a blank recordable CD or DVD; and single-disc version of Windows XP Home Edition or Professional with Service Pack 2 or later.

Apple's comment:
“Apple has no desire or plan to sell or support Windows, but many customers have expressed their interest to run Windows on Apple’s superior hardware now that we use Intel processors,” said Philip Schiller, Apple’s senior vice president of Worldwide Product Marketing. “We think Boot Camp makes the Mac even more appealing to Windows users considering making the switch.”

Pricing & Availability
The public beta of Boot Camp is available immediately as a download at www.apple.com/macosx/bootcamp, and is preview software licensed for use on a trial basis for a limited time. The final version of Boot Camp will be available as a feature in the upcoming Mac OS X version 10.5 “Leopard.” Apple does not provide support for installing or running Boot Camp and does not sell or support Microsoft Windows software. Apple welcomes user feedback on Boot Camp at bootcamp@apple.com.