I'm presently thinking about a project and I wonder if it is possible to use a 3D monitor as a second screen with an iMac 27" with the nvidia 3D enable?
Nvidia 3D is a software/driver thing. Not included in OS X I believe. If you BootCamp (not virtualize) Windows, you might have some luck if you use NVIDIA drivers. But I'm pretty sure you can't do this on OS X.