I have a the 8800 GTS 512 and have been having the issue but only with the online 3D game DDO. I have tried the usual fixes like dling the latest drivers. It seems totally random and some days I will not crash but others its several times in a hour. I was actually searching for info when I saw your quest for answers. My next step is a system wipe and start fresh.
If I stumble across something I will send a reply