Is there a way to stream what is on my Mac's screen to my TV?

Question

I want to buy a Mac App Store game, but I don't want to play it in an office chair: I want to sit in front of my TV! Is there a way to stream the video output of Mac, wirelessly, to my television? The TV is currently connected to a Playstation 3, Wii, and AppleTV, and if this is at all possible, I'd like to do it without having to "hack" any one of those devices. Is there anything I can do here?