Mark just wasn't satisfied with 3D glasses on his SGI machine, so he adapted them to work with any video card with a VESA-compliant stereo port - Now in all, it's not too complicated what I do here. The SGIs have around 10-12 volts on the stereo port, while (same connector, same pin-out) the VESA stereo port has 5 volts on pin 1. In short, what I do here is only taking the stereo sync signal (pin 3) of a VESA-compliant stereo port and get 12 volts and ground from a Molex-connector, so in all we have the same. Quake-time!
How-to, info, and more pics - 3D glasses for any VESA compliant stereo port
http://blog.makezine.com/archive/2008/07/how_to_3d_glasses_for_ves.html