I own a 3DTV and a 3D projector mostly for playing games in stereoscopic 3D. I can't play games in 2D anymore - they look to flat - bland - blah.....
There are currently two marketed options: Nvidia's 3DPlay or Tridef's 3D driver. Ether option will set you back ~$40. Both options depend (somewhat) on 'profiles' being made for any given game. Both options have somewhat 'automatic' modes that sometimes work better than the other. Some titles may get supported on one and not the other. There are currently dozens (if not 100's) of games available on ether S3D solution.
It must be said that playing in S3D is not "free" as there's a performance cost - how much depends on your gaming rig and which S3D driver solution your using. Many dedicated S3D gamers have very powerful gaming rigs to keep the S3D frame rates as high as possible.
With well adjusted convergence+depth even 720P needs very little AA in S3D. The added depth (+some pop out) naturally draw you away from whatever 'jaggyness' that may be visible in 2D at the same resolution.
Tombraider2013 in S3D on a 100" screen with 5.1 sound - something that needs to be seen and experienced!