Well, in fact our system allows for non-software projects quite nicely. But we decided our first focus would be software, mainly because we didn't want to sprea

Well, in fact our system allows for non-software projects quite nicely. But we decided our first focus would be software, mainly because we didn't want to spread ourselves too thin too quickly. Anyway, your FaceApps Developer Expo sounds like a sweet microPledge use case. Users can withdraw their pledges if a project doesn't finish on time (e.g., you don't get enough money for the event and decide to call it off).