try this one: connect the TV to the TV-OUT at the AGP device.
I configured it as clone, but of course you can configure that. just read the part of the README that handles TV-OUT. if you want to use rightof, you HAVE to adjust the resulting resolution: 2 times 800x600 results in 1600x600 as resulting resolution.
if you want a 3rd display, you can start from there and add another device and all that...
important is that everything that's connected through the nvidia device has to be handled in that section! the TV-out has to be handled there....
no xinerama needed for such a thing.
and last but not least only opengl supported in the first head.
Alien is my name and headbiting is my game.