Go to a Startup Weekend event. Business startup in 54 hours.
I just went to this event a couple of weeks ago. Very cool. If you have a business idea you pitch it to the other attendees. When I went there were ~70 people, ~30 business pitches. Everyone votes on the top 10, then people join whatever project team they want. Developers, graphic artist, moble app guys, marketing, sales etc. People joined teams based on their interest in the project, their talent or to find something to challenge them. Talent gets ‘traded’ too. “We have too many developers & we’ll trade you for a database guy” You can see the results of the last one here http://sandiego.startupweekend.org/
There were a few mobile apps developed during this weekend.