After my initial tinkering with Windows XP on my 17" iMac Core Duo, I reinstalled XP on my Mac, using Boot Camp to eliminate the original partition and build a new one, this time 20GBs in size, so I'd have plenty of room for games. I then installed World of Warcraft, since I already had a copy installed on my OS X partition that I was very familiar with and which would serve as a nice comparison. The results: WoW on Windows XP on my iMac, running fullscreen on my external 24-inch Dell monitor with all the graphics settings ramped up clocks in at about 6fps faster than my OS X installation of WoW, running fullscreen on the same display with the graphic settings pulled back to their default settings. Nice!
Let the PC gaming on sleek Mac hardware begin!
ps--sorry the picture above taken with my cameraphone isn't better.