There's a new SETI@Home-style project running for the Year of Physics thing. It's called Einstein@Home and is part of the search for gravitational waves.
http://einstein.phys.uwm.edu
Ive started a team for the University of St Andrews if anyone is interested in joining.
http://einstein.phys.uwm.edu/create_acc ... eamid=1416
Let your CPU idle time go to good use. Plus, you get a cool screensaver to go with it!