I have a friend that went to an event in Germany (it was not GDC) where he saw Wipeout HD running on a PS3 in 3D.
He said that he looked to the big ass TV through the 3D glasses and there was a spaceship floating in front of the TV. Like, he could "touch" it.
He said the effect was way above the one you get with red-blue glasses and cross eye techniques.
Since he told me this, I am hyped to try it.