I seem to have trouble with committment, as usual. 😉 Edit: I guess I'll enumerate them:
SETI:
Athlon 800 0-16x
RC5:
Athlon 800 1x
Celery 667 (at times)
PII-400 (at times)
ECCp:
PII-400 (at times)
F@H:
PII-400 (at times)
Athlon 800 0-16x (maybe in the future)
Proth:
Pentium 200mmx (at times)
[various other machines, at times]
As you can see, my PII jumps around. Currently I'm deciding between ECCP and F@H on that machine, and I may migrate the Wildnet to F@H at some point.
I guess I'll vote SETI, but that may change. 🙂