If you're still having trouble with EverQuest II and your nVidia 8800, rest assured that we haven't forgotten about you.
In my talking points on the subject in the past, you'll note that we added a feature called "Reuse Vertex Buffers" that seems to alleviate the problem for some folks. However, it doesn't completely fix the issues that EverQuest II (and other games) are having.
We're currently working with nVidia specifically on this problem and are currently testing out some super-top-secret-internal-only-penalty-of-death drivers in our compatibility lab with high hopes. I'll keep you posted when I hear more.