I noticed that Seti.Germany is starting up a new gauntlet; Boinc Pentathlon http://http://www.setigermany.de/boinc_pentathlon/22_en_Welcome.html
Not that I'm running any boincing now but the graphics looks fun anyway
19 primes found. The largest: 1351*2^617684+1 (185945 digits)
I only have 3 pc's running right now, but I'd give it a go if there is interest..
I'll be out of town for most of this, so it would be difficult to keep switching projects. If I knew ahead of time, I could start running one of the projects in earnest before I leave, so I could contribute to that discipline at least. Primegrid would be my preference for the math discipline, though I suspect BigRed would prefer Collatz.