Re: Two monitors, tv-out and a couple of more fps for games...
No, I haven't seen any lockups. The only bug (I guess) is that my overlay fails to initialise (no video, just a blue screen) the first time it's invoked. It's quite irritating, but not more, I just have to restart the second X-server.
What does your XFree86.1.log-file say?
If it's of any help, here is my setup:
GeForce FX 5600, 6111-drivers, (4xAGP, with fast writes and SBA enabled)