I ran across this interesting idea last night, and thought it deserved mentioning to a wider audience: [[Wikipedia:Bounty board]]
Basically, users offer to donate $X to the foundation in return for someone doing Y - for example, take [[Médecins Sans Frontières]] to FA status, and you get the warm glow of knowing the foundation is $20 better off.
Not sure how good a motivation this will turn out to be in the long run, but it does sound like an idea worth trying; $35 seems to have been "won" so far, and as no-one but the Foundation profits there doesn't seem to be any legal pitfalls waiting to happen.
-- - Andrew Gray andrew.gray@dunelm.org.uk