Nothing like getting it directly from the horse's mouth, so to speak. Macworld goes through the ordeal, & attempts to answer the question of whether installing WinXP on your x86 Mac is actually worth the hassle.

"After drawing the short straw volunteering to help out, I set out to see what it would take to install the hack, get XP up and running on my Intel-powered Mac mini, and then see what kind of Windows XP machine I had on my hands."