Apparently the NVIDIA driver really includes OpenGL stuff--but I'm not sure it's using the right stuff.
Of course, the big problem is the test programs are all windowed apps, not fullscreen apps--so I think I need to write/find a basic fullscreen OpenGL app that I can bork into stereo.
Meanwhile: NVIDIA Stereo Development Guide, which isn't completely helpful other than saying for sure that stereo won't work in windowed mode.