MaximumPC reports that Nvidia plans to release Stereoscopic glasses later this year. Here's some info:

You're not going to be convinced unless you try these in person, which we did at last month's NVISION festival. Nvidia gave us several opportunities to try out the tech, once during their CEO's keynote address (on a cinema-size screen), on a 73” Mitsubishi DLP television, and also on a new 120Hz Viewsonic LCD display. The three-dimensional effect is definitely incredible, especially with the larger displays. We saw Call of Duty 4, Age of Empires III, and the racing game GRID demoed on these units, and each game was significantly enhanced with the use of 3D.

The illusion was most convincing in Call of Duty 4, which uses depth-of-field blurring for objects in the distance (especially when we aimed down the ironsights of a rifle). In the real-time strategy game, the HUD controls popped out of the screen, making us feel like we were looking through a window onto the battlefield. And in GRID, when cars spun out of control, they weren't tossed off-screen, but at us. The point is, if a game is rendered with 3D graphics, it can take probably advantage of 3D stereoscopic technology. And with Nvidia's new hardware solution, 350 new and existing games will work out of the box, with no game-specific drivers required.

They have posted an interview with GeForce Stereoscopic 3D Product Manager Andrew Fear, and they learned some interesting details:

Q: How does it work?

AF: The NVIDIA GeForce Stereoscopic 3D driver works at the lowest level by taking 3D game data and rendering each scene twice - once for the left eye and once for the right eye. Each eye image is offset from each other for the correct viewing. The GPU then sends this data to a 3D Ready display. These displays show the left eye view for even frames (0, 2, 4, etc) and the right eye view for odd frames (1, 3, 5, etc). NVIDIA 3D glasses then synchronize back to the 3D Ready display and present slightly different images to each eye resulting in the illusion of depth and an incredibly immersive experience for games.

Q: What software and hardware is needed?

AF: You'll need a PC with the following:

- An NVIDIA GeForce 8800 GT GPU or better
- Windows Vista 32-bit (64-bit support coming soon)
- Standard Microsoft DirectX game that NVIDIA has preconfigured in our driver (to date NVIDIA has preconfigured over 350+ games).
- A supported 3D Ready display. To date we have announced support for ViewSonic® pure 120 Hz LCDs and Mitsubishi DLP® HDTVs.
- NVIDIA stereoscopic 3D active shutter glasses (coming soon)

The technology hinges on displays with fast refresh rates (think 120Hz), though, so don't expect to get a stellar experience on your five-year-old Acer monitor. Aside from the fast display, Fear says you'll need a GeForce 8800 GT or better, a 32-bit copy of Windows Vista (64-bit support is "coming soon"), a pair of Nvidia's own stereoscopic 3D glasses, and a compatible game. Nvidia claims to have implemented support for a library of over 350 existing DirectX 8, 9, and 10 titles, although OpenGL games like Quake 4 and Prey aren't supported yet.