I'm Bootcamping AoC with Boot Camp 2.1 and Windows XP 32-bit. I was running Windows XP 64bit, so I could get use of as much RAM as possible (I have 3 gigs currently), but I couldn't find the driver to get the WiFi working.
Everything runs wonderfully, but I can not run full bore on all the options. I run the native resolution and most settings at med-high, all draw distances at max, and I have no problems. Occassionally the FPS will drop below 15 and cause some stuttering, but most of the time I'm hovering right around 20-24 fps.
I could, of course, lower the resolution or put everything on medium, and still have a very pretty game, but I really don't notice it. I've probably put a good 20 hours into the game, and I'm still tweaking.