A longstanding bug found in Nvidia's last few driver releases has yet to be fixed. Their "Direct Access" feature which allowed users to control their monitors from the ForceWare control panel still suffers from what some consider a serious, and potentially hardware damaging bug. Nvidia has updated their driver page with new 81.98 ForceWare drivers, which have removed they Direct Access feature.
The new drivers also add support for Nvidia's recently released GeForce 7800 GS AGP cards. You can grab the drivers over at Nvidia's site.