Windows XP on hard drive A, Linux Gentoo on hard drive B, installed in that order, and it seems like I'll have a pretty nice setup. Once I install both OS, it shouldn't be too hard at all to make the Linux hard drive the one that boots first by default. My Linux drive will be devoted to everything utilitarian and functional, like word processors, internet browsing and such, and my Windows drive will be pretty much PC games only. I'm only bothering with Windows at all because I have enough PC games that I can't live without.