World Community Grid's mission is to create the world's largest public computing grid to tackle projects that benefit humanity. Our work has developed the technical infrastructure that serves as the grid's foundation for scientific research. Our success depends upon individuals collectively contributing their unused computer time to change the world for the better. World Community Grid is making technology available only to public and not-for-profit organizations to use in humanitarian research that might otherwise not be completed due to the high cost of the computer infrastructure required in the absence of a public grid. As part of our commitment to advancing human welfare, all results will be in the public domain and made public to the global research community.
The software created by IBM is not obtrusive and most people wouldn't even know that it was running. You can even join teams and compete for the heck of it to get the most points. I am on the Nashville, TN team, but there should be a Nashville Bloggers team. Check it out and make your computers down time do something.