I have never played any REAL (bugdom doesn't count) games on my Macs. I am thinking of buying a game for my new 1.5Ghz PB. With Halo and Half Life and WoW and some of the others, I thought it was as good a time as any to get a game and start. 1st timers questions: Have you all bought a USB controller for these games? If so, which ones are good and which ones suck?