O'Reilly is selling a PDF for $8 that takes you through the process of installing Windows XP on a Mac.
Running Boot Camp guides you step-by-step through the entire installation process, including upgrading your Mac's Firmware, creating the Macintosh Drivers CD to make XP work properly with your Mac's hardware, and using the Boot Camp Assistant to partition your hard drive and install Windows XP. You'll also learn how to avoid common pitfalls (such as previously partitioned drives and wrong disk permissions). And finally, you'll find out which Mac functions don't work in XP and which XP features backfire on a Mac. With this invaluable guide at your side, you'll finish configuring your dual-boot Mac in as little as two hours,
avoiding numerous hazards and annoyances along the way.