Dwolla, highly innovative payment network, celebrates its second anniversary by hosting a hackathon in its birthplace: Des Moines, Iowa. To complement the unusual choice of geography for a hackathon, Dwolla chose a name to fit the occasion: Old MacDonald Hackathon. Dwolla and co-host, Silicon Prairie News, aim for 50 developers to enjoy the scene and conjure up some disruptive applications utilizing Dwolla's APIs.