There is a project called PS3GRID that also has a Boinc client
http://www.ps3grid.net

Folding@Home has a project
http://www.stanford.edu/group/pandeg...g/FAQ-PS3.html

Not too many at the moment, but seeing that the PS3 only came out about a year ago, it's looking promising.
http://news.bbc.co.uk/2/hi/technology/7074547.stm

Do a little google work and see what's going on around you