Quote Originally Posted by pvtcupcakes View Post
I'm skeptical of this info. It lists X360 as well, but I'm pretty sure Steam isn't coming to the Xbox.
They already had to sort of porting for the Xbox. Left 4 Dead, Left 4 Dead 2 and The Orange Box are ported on to there, so they've implemented some back end for those games to work. They probably have a hacked up steam client library that allows L4D to use it's built in lobby system with Live.