If they made COD4 able to play VS PC, they would have to dumb down the controls, i.e. the mouse would go the way of the Halo cross hair and aiming, to make it "fair" for the thumb controllers. If you want to play vs. 360, get a 360. LIVE for 360, good, LIVE for PC's very bad. Does not allow for mods and server tweaks unless approved by Microsoft.