CYBERSKA

 A Cyberinfrastructure platform to meet the needs of data intensive radio astronomy on route to the SKA

theSkyNet

http://theskynet.org/

"theSkynet is an exciting online project where your idle PC can become part of a super-network of computers helping us learn more about our universe.
By taking part, your PC will team up with others from around the world to crunch real data from outer space."

Similar to BOINC but differs in that java applet is used to run the sofware from the users browser (volunteer does not need to download/install software separately).