Nvidia has released the GeForce v258.69 beta driver, adding support for 3D Vision Surround which allows certain setups to display 3D graphics on three monitors.
If you are seriously wanting this setup, you will need three identical 3D Vision-compatible displays (such as Alienware's 23" OptX AW2310), two Nvidia GTX 260s or better running in SLI, Nvidia 3D Vision glasses, Windows 7 (Vista and lower aren't supported) and, of course, the latest GeForce beta drivers.