Imaging fighting cancer, ALS, Huntington's or Mad Cow Disease on your way to work, or while you are asleep. This can be done by everyone with a computer by a process called distributed computing. Stanford University isn't alone in using unused CPU time for good but they have the goal of using your computer's idle time and cpu for cancer research, Alzheimer's research and Parkinson's research. See Stanford's site for details.
There is also the Help Conquer Cancer Project. This project runs on the IBM sponsored World Community Grid. With distributed computing the Conquer Cancer researchers hope to use the World Community Grid to reduce computer time for certain research calculations and modeling from 162 years to 2 years.