I finally got around to installing Boot Camp + Windows XP on my 20" iMac for LAN gaming and have been very impressed with the performance of the machine for gaming! I have a "Rev A" 20" iMac (Core Duo) with 2GB of RAM, X1600 256MB. Far Cry runs great, 45-60+ FPS (usually keeping close to 60) with ALL settings maxed (Very High), at 1280x768. I don't usually try games higher resolution then that, as 1680x1050 is just too demanding, but games still look great a step down in resolution. Overall I'm quite surprised, I didn't get the Mac intending to game on it, and never expected performance this good.