I know my 1ghz iBook isn't a games machine, but I'd like some pretty 3D thing to show my friends...
Anyway, on PC there is a great (free) benchmarking program called 3DMark (by Mad Onion). It ran all these animated scenes to test out your hardware, but also looked really cool. Is there anything like that for mac?
Failing that, what's the newest Myst style game for Mac?