xlr8yourmac has some great news on the status of Mac Quake 3 1.27. Apparently the beta version has been released and is available for everyone to download. Team Arena should also work now, however I think this is not the final word on the Mac version of TA there.
MacWEEK again writes about the MP capabilities of Mac OS X. This is really a promising new feature that owners of G4 MP machines are going to love, I'm sure of that:)
Blizzard has finally updated Diablo 2 fixing a lot of bugs, also Mac Quake 3 1.27beta and the Mac Team Arena Demo have both been released officially. Make sure to check these out. MacGameFiles.