Guru3D released Rivatuner 2.01 (download), their complete powerful tweaking environment, providing you everything you may need to tune NVIDIA GPU based display adapters. This new version includes a huge number of stuff to keep you busy, obviously GeForce 8800/8600 support is here as well. They added support for  ForceWare 100.xx, 101.xx, 158.xx and 165.xx driver families, Catalyst 7.1, 7.2, 7.3 and 7.4 drivers detection, NVIDIA G84 and G86 GPU family support, improved G80 GPU support and much more. The complete changelog can be found here.