ARIS Games is hosting a Game Jam. They are calling on people to create Augmented Reality games. You can join them in person in Madison, WI or stay and home and be an armchair game designer.
I haven't had a chance to check it out yet, but they have an open source programming tool that is supposed to make the creation of an Augmented Reality game simple enough for a novice to do. They are so sure people can do this, the Game Jam is being held over a weekend (50 hours) and they expect people to create at least 50 games during that time.