xlr8yourmac notes that Apple now sells Radeon cards separately, has some P4 vs G4 comparisons, some trouble with the just-released Oni demo and some other stuff.
Oni demo out
MGF and many other sites have info and links to download the ONI demo for Mac. It's 77MB and it is carbonized, so you can also run it on OSX, if you want. I guess that's a great game for those who like that sort of stuff.