This cool project, Climateprediction.net, allows you to help with climate research. The site links to a program called Boinc, which allows scientists to use your spare computing power for their research projects. While the project is running, you can watch visualizations of the research as it takes place. In fact, you can help with all kinds of projects--as many as you want.
If you decide to try it, please join our team. We'll see if SMM fans can become one of the top contributors!