of course...the original XP fit on one disc as well
and unless you bought a dell or HP pc loaded with crapware, windows xp is a lite os
but nevermind those details
anyway, XP is rock solid and is probably the "best" to bootcamp with
if you have 4gigs of ram, a true dual core processor, and a new video card, you're better of with vista. but can you do vista on mac? hmm, seems like an irrelevant question anyway.
black mesa: source might be of interest to some of you half-life fans, it's a remake of source all redone (which is going to be compared to half-life: source no doubt)
http://www.youtube.com/watch?v=oGlhgVz5r6E