I've been using Steam as virtually a home game console since I found the ability to pair my iMac with my Apple TV for Airplay. The only problem I have is there seems to be no setting for putting your monitor to sleep while you Airplay to Apple TV. Since both end up in use, I'd rather the monitor be off or I would simply just play off that, although the TV is much bigger!
Also another feature I'm not sure of is Airplaying a program while the computer is still in use. For example, I wish I could Airplay my Steam games to my TV while my girlfriend watched a movie or looked at Facebook at the same time. That would be epic.
