The service is called "Windows live". excuse me, 'Windows-LIVE".
Shadowrun, for example allows for Xbox vs PC competition.
As far as I know, no publisher other than Microsoft has made games, or made plans for games for Windows-LIVE.
Windows-LIVE requires a paid subscription to play cross platform.
You do not need to have a paid subscription to play cross platform with pc, even then you get a free month live trial with every live pc game
i play shadowrun quite often one of my most favorite games. what i like most about it though is that i can play with my xbox friends over pc
if they "dumb down" the controls it would only make it more realistic. shadowrun uses movement vs crouching to help aiming and recoil same with fire rate, honestly it would be only fair.
I actually have a friend who can play me in halo2 on pc with a gamepad and destroy me.
nothing the less he use to be a halo 3 pro.