First, the driver is much more stable since I installed 180.25 and removed all the extra options in xorg.conf. I've not got a crash similar to I mentioned above. But there's a panic caused by NVidia driver allocating too much kernel memoy... But I think this may be caused by compiz.
Second, the OpenGL performance is somewhere better... Although it's mostly the same. With compiz on, I have glxgears ~2000 FPS.
I'm using FreeBSD 7-STABLE, with Geforce 8600 MGS.