Re: 190.42 nvidia / evdev issue
I see you have TripleBuffering on. I had it on, too, and had stability issues immediately with Fedora 12 (xorg 1.7.1). As soon as I commented that option X became stable.
edit: I had very similar backtraces to yours, but X froze and would not let go. Sometimes it would flicker the image very rapidly when "frozen."