I just tried installing Windows on my Intel Mac last night, but had some driver issues. It turns out it was because I had on old install disc of XP that didn't include any service packs -- and SP2 is required for the Mac to run Windows.
So what to do? Slipstream SP2 into my install disc. This thread at Apple Discussions explains how to add SP2 to your older XP install disc, so you can install it on your Intel Mac.
[robg adds: Yes, I know we need a new category (or categories) to cover hints such as this one, along with Intel Macs in general. Coming soon...]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20060406110257207