NVClock 0.7 is out !

NVClock is a small utility that allows users to overclock NVIDIA based video

  cards running on the Linux platform. The original code used in building this

  application was borrowed from the nvcs application. That code has been extensively

  reworked in order to make the utility much more user friendly and to make it

  play nice with current distros and drivers.

More on NVClock Website