I've just updated my GeForce drivers today, and RAGE has been added to the 3D compatibility list with the rating "not recommended". AFAIK, 3D Vision only works in Direct3D. This probably means that RAGE doesn't use OpenGL, which is a shame considering how Id Tech has been one of the biggest representatives for the API. It might explain why no Mac port is coming.

No loss for me. I hate the 3D fad anyway.

Agreed. 3D is just a fad and a gimmick. According to Carmack's QuakeCon Q/A they didn't spend any time adding support for 3rd party technologies such as 3D Vision and Eyefinity. He said he will look into some things once the game launches and they could be added in later.