There's a couple of things that sort of define a platform. For Windows, I believe it is/was Office. For XBox, it was Halo. For XBox Live, it was Tom Clancy's Ghost Recon. I just finished playing Midtown Madness on XBox Live with FunSlayer and DanO. I think that game has redefined what gaming should be. We were carrying on little school girls. The game is just a blast especially Tag and Capture the Gold (which were the only two we played). Kudos MM3 team. That game kicks some serious backside (I am so PC).