A marketplace for mobile design/development
ooomf allows you to find and hire prescreened mobile developers and designers. They are what we would love to be when we grow up (and have enough developers ourselves to start creating that kind of marketplace). Wannabe collaborators have to create a profile and upload work samples to be eligible. Clients commissioning work also have access to a neat project cost calculator tool. Their business model is based on taking a cut of the project's cost, once the right team has been found and assigned.