Xbox Live

Yesterday I was at the local "Wal-mart" and noticed this box. It says "Games for Windows" and "X-Box 360" I was wondering if this means that Xbox 360 and Pc's are playing games in the same servers? Essentially they are both computers, but I would think PC gamers have a advantage over 360 players simply because using the keyboard in my opinion is a lot easier then using the controller. Hmm....
Carpe Noctum