Since my original plan to avoid sticking my neck out by signing up only after a lot of other people did has a certain easily perceptible flaw...

...25 dollar one-time commitment to the charity chosen. Reserve the right to retract commitment if the system breaks down for some reason, ie obvious joke votes. Can't afford any more as I am a student, but hopefully this will prime the pump a little.

EDIT: In response to Eliezer's request, I retract this commitment, possibly in favor of whatever Eliezer's project is.