Based on the popular custom here in north America of take a penny give a penny a guy called Jonathan Stark got a starbucks card and gave it to the social world, with the premise that people would spend his card and also add to it.
looking at the API which lets you know the balance it seemed to start off well but is sitting pretty at 0 balance at the moment, I hope it goes back up without Jonathan having to delve into his pocket again.
Check it out here.
