NVIDIA announced new software that uses the processing power of GeForce video cards for other applications than graphics and games. The new GeForce Power Pack includes the Stanford University’s Folding@home distributed-computing, protein-folding client and a trial version of Elemental Technologies' Badaboom video transcoder.
Folding@home is already a huge success on the PS3, now also PCs can leverage their graphics prowness for the good.
GeForce Power Pack programs are part of a growing number of applications that use the power of NVIDIA GeForce graphics processing units (GPU) and NVIDIA CUDA C-programming technology to significantly improve the performance of non-graphics applications by transferring the workload from the CPU to the more efficient GPU.

All of the 80 million plus GeForce 8 Series and higher GPUs in the field are CUDA-enabled, the largest installed base of general-purpose, parallel-computing processors ever created. The same GPU architecture that delivers stunning onscreen computer graphics in video games is also ideal for many other types of applications. The latest generation of NVIDIA GeForce GPUs offer up to 240 processor cores, compared to a maximum of the four cores found on the highest-end CPU. Any process that can be divided into multiple elements and run in parallel can be programmed to take advantage of the massive processing potential of the GPU.
Via this NVIDIA announcement. The GeForce Power Pack is supposed to be available for download at www.nvidia.com/theforcewithin (page not available at time of writing).