Didn't see this mentioned in the past, sorry if it was a repost. My wife got me COD MW2 for Christmas, and as I hadn't played anything in a long while, I needed to update my drivers. To my surprise I found Steroscopic 3D settings in the Nvidia control panel. I didn't think much of it at the time because I thought you had to buy the polarized glasses and one of the new 120hz small LCD's.
Today I found out that is not the only option. You can use the red/cyan glasses that come with the 3D movies that are so popular nowadays. I just tried it out in G3 as well as MW2, G3 has an "Excellent" rating and I would have to agree. The best part is there is NO double image. You can also adjust the depth and convergence in game.
If you've got an 8 series card or later you HAVE to try this. I'd also be interested to see how other sims work, especially the ones that use static images for backgrounds.