"Jonathan's Card is an experiment in social sharing of physical goods using digital currency on mobile phones."
What, exactly, is the hypothesis? While this _seems_ cool, I really don't understand what he's setting out to prove, that we don't already know: This will work until the number of people who abuse it grows to a certain point, after which everyone will loose faith, and nobody will contribute more funds.
[Ha. I just noticed the posts describing how this is being hacked.]