Doing a li'l side project (a robot, to be specific) and I need BRAAAAAAAINS for it. As long as it turns on, I can throw Windows XP on it, and has working USB ports I'm pretty much set.

Battery doesn't need to hold a charge, though it'll be nice if other things worked.

Yes I can buy a super crappy laptop on eBay for $100 if I needed but I figured I'd ask if someone had something collecting dust in a storage box. BONUS points for being cheap, yay!