Wow - I'm impressed. After playing the mac version of COD4 (Multiplayer) on my MBP, I decided to see if it would run on my new MBA rev. B. I used disk utility to make an image of the disk, then copied the image to the MBA and installed it. It runs. It runs well. I even turned up the graphics a touch to 1280x800 and it still runs nicely. I'm not sure what the frame rate is (or how to check) and it does seem slower than the MBP, but it runs none the less. And to think - I was worried the MBA would have enough power for me as a travel computer!