If it is xorg 7.1 I read a thread saying that it was broke even with the latest binary driver from NVidia and the guy had to go back to xorg 7
Have you tried using the binarys from the Nvidia web site ?
also theres' a bit of info here http://gentoo-wiki.com/HOWTO_Modular_Xorg
Let me know how you get on because Im still using xorg 6.8 and will have to move up to xorg 7 soon but been holding back because there still seem to be a few probs with 7
Just noticed in title you say Xorg 7.0 dah!