Apologies if this has been posted, I searched but all of the prominent keywords are pretty common and there are a few forums where it could show up.
 
Sony just announced a $500 24" TV that does 3D and can offer full screen, same screen multiplayer. You don't need that specific TV to do it. I'm not sure if all 3D TVs support it, but here's a video of how one guy did it with his 42" Vizio.
 
    

I've never been a supporter of the 3D movement, but this is really cool.

Seriously, I had 3D, but I love this technology. I'm not surprised that it's working on other 3D TVs. I kind of feel like an idiot for nothing thinking of this. It's so obvious in retrospect.

I've never been a supporter of the 3D movement, but this is really cool.

After watching the E3 Day 2 video, I wonder if staff know about this yet.