That's actually a really interesting model. Here's the Wikipedia entry on the subject http://en.wikipedia.org/wiki/Threshold_pledge_system http://en.wikipedia.o

That's actually a really interesting model. Here's the Wikipedia entry on the subject http://en.wikipedia.org/wiki/Threshold_pledge_system http://en.wikipedia.org/wiki/Threshold_pledge_system (redirect from ransom model) It's not free as in beer though.