Still, I'm not really interested in Radioactive@Home, QuakeCatcher and Enigma, MilkyWay on the other hand looks like something useful, to which I'd happily contribute.
Hopefully the BOINC team and the associated project teams will soon recognize the potential in the Raspberry Pi. They are selling more and more Pis world-wide and people are probably more willing to run such projects 24/7 on low-power machines (like the Pi) than to keep juice-greedy computers running, which have an effect on their electricity bills. So let's hope that in a few months all BOINC projects will be supported out of the box