According to Ken Kutaragi a program can be downloaded to your ps3 to do advanced calculations for folding proteins. All in the name of science. But how can we be sure?
Just imagine some malicious company using your ps3 to do military research and ballistic trajectory calculations, making you a potential genocide accomplice.
I'd like to choose which research that would benefit from my idle ps3. I'm paying for the hardware and the electricity, so I should get to decide.

Oh, and Ken is nuts.