I don't expect this to happen at anytime soon, and don't want to debate whether it will/won't happen, but hypothetically if BTC dies/tanks, it gets too expensive to mine or individuals just plain get sick of BTC mining, what other options are there out there to make use of all this computer equipment people have purchased for Bitcoin mining?

I know of a few other distributed computing projects like Folding@Home, BOINC and even GIMPS (CPU Only I think?).  All of these are volunteer and don't have any payback, other the prime searches having some possibility of getting a reward if you get lucky and find a new prime.

Does anyone know of any other distributed computing projects that all this mining gear could be put to good use for, volunteer or paid?