Despite what I had originally expected, the on-board Radeon 9200 is a bit of a performance limitation. I had the Mac mini hooked up to a 23" Cinema Display running its native resolution of 1920 x 1200 and was wondering why Exposé and a handful of other animations were choppy. After tinkering with resolutions, I found out why. At resolutions above 1280 x 960, the Radeon 9200's 32MB of local frame buffer isn't enough to handle Exposé of even just four windows - swapping to main memory, and thus reducing the smoothness of the Exposé effects. At 1024 x 768, it's great and it's even fine at 1280 x 960, but once you start going above and beyond that, you start running out of video memory real quickly. I am concerned about performance under OS X Tiger, simply because with more being stored in video memory (e.g. font caches), you'll run out of video memory even quicker. Granted, what I'm discussing right now isn't a reduction in actual performance, but rather a reduction in the smoothness of animations - which to a first-time OS X user can be a huge turn off.