RivaTuner 2.23

RivaTuner is out now. For those who want to overclock their GPU.
RivaTuner is a complete powerful tweaking environment, providing you everything you may need to tune NVIDIA GPU based display adapters. The widest driver-level Direct3D / OpenGL and system tuning options, flexible profiling system allowing to make custom settings on per-application basis, both driver-level and low-level hardware access modes, unique diagnostic and realtime hardware monitoring features and exclusive power user oriented tools like built-in registry editor and patch script engine make RivaTuner's feature set absolutely unmatched.
RivaTuner supports all NVIDIA display adapters starting from Riva TNT family up to the latest GeForce 7 series and widest range of NVIDIA drivers starting from the oldest Detonator 2.08 up to the newest ForceWare drivers family.

RivaTuner 2.23 click here

For more info, read this article from Guru3d.com
RivaTuner

And for anyone interested that uses RivaTuner someone has made a Sidebar gadget for RT,

Rivatuner GPU Monitor Vista Sidebar Gadget