I just signed up to the Einstein@Home project, which aims to find pulsars using data from the Laser Interferometer Gravitational Wave Observatory (LIGO) and GEO 600 gravity wave detectors. Einstein@Home will use my computer's idle CPU cycles to process some of the data collected by the detectors. Previously I donated my CPU cycles to the SETI@Home project.
If you are interested to join the project, please go to this site. You also need to download a BOINC client here.
LIGO's site can be found here. GEO 600's website can be accessed at this link.
Picture: The GEO 600 gravity wave interferometer, located in Hannover, Germany