The reason I have a dual-boot system now is so that I can run old Windows games. But -- darn it! -- it turns out I almost never need it at all.
Case in point: Pro Pinball Big Race USA, which I got from Good Old Games. Choppy sound excepted, Big Race USA runs fine on Wine on Jaunty. However, it borks at startup under Windows XP. Hoo-boy. How's that for irony?