thanks guys
am curious though, does it let you render games that weren't made with 3D in mind in 3D?
That is the beauty of it. The S3D drivers use the existing depth (Z-buffer) to calculate 3D. The issues only come up when the HUD (for example) is rendered at the "wrong" (2D) depth compared to the other objects; or the Sky rendering (as in Oblivion or Gothic 3) may be 2D and very distracting in a S3D environment.
i got a 3D Vision Surround bundle from Nvidia (active shutter glasses/emitter/3x120Hz 1080p ASUS 24" displays) to evaluate 5 months ago for my tech site. During that time, i have played nearly 100 games with it in S3D - 6 from start to finish and i am writing what is turning into a mega-evaluation now.
*Most* of the old games (from about 2002) are pretty good in S3D and some are extra-ordinary. Nvidia has evaluated over 500 games and about 15 are considered "3D Ready" - created with S3D in mind. The rest are graded from (not recommended and) fair to excellent (6 grades).
OpenGL games and very old games (that that don't work in HD resolutions) probably don't work so well or require an extra-ordinary amount of tweaking. There is also a lot of hot keys with 3D Vision so that you can tailor your S3D experience to your own vision and liking.
i have not yet evaluated HD3D which is AMD's own S3D. Theirs is an open standard which means it has taken longer to implement than Nvidia's solution. AMD is working on S3D with its partners to improve the experience.