I have 7600GT PCI-X, and I had some X freezing issues with 180.22, which I didn't had with Beta versions of 180 driver. I can unfreez X by unpluging and pluging back in my USB keyboard. Then X unfreezes or restarts (don't know if this is because I pressed few times ctrl+alt+backspace before unplugging keyboard). Please nvidia devs, fix this.
I'm using Ubuntu 8.10 with 2.6.28 x86_64 kernel that I compiled with Core2 optimization.