I haven't found any general comparisons between the two and am new to gaming via Boot Camp. The two concerns that come to mind that I'm curious for your opinions on: Drivers: I've read, and had a little experience with the annoyance of not being able to update the drivers to the most recent versions, most notably video card drivers from ATI/NVIDIA. Is this issue overcome or worsened by either XP or Vista? Resource usage: I've heard complaints about Vista being a resource hog with respect to general OS use and have seen suggested specs for games list two different numbers, the greater of the two linked to Vista. Has anyone noticed/tested Boot Camp gaming in both XP and Vista and noticed a resource difference?