I have actually been trying to do exactly the same thing with an AGP GeForce2 MX200 64M (TV-out), and have had the same results using the above mentioned site. The card has been sitting on my desk for months now without me getting any furthur with it. I would be very interested to hear of any solutions for the problem.

Incidentally, I have tested my card and it works fine in PCs, but when I try it in my G4 the screen displays a TV signal-like "static" effect and a lot of other garbage. Maybe the PC MX200s just aren't suited for Mac use.