Augmented reality is fun but -- let's face it -- kinda gimmicky. Kids, though, they love gimmicky. The 'Helicopter Taxi' iPhone app lets children fly a virtual 3-D helicopter around the real world, picking up and dropping off virtual passengers along the way. It should be said that 'Helicopter Taxi' is not a game, as there are no points to earn or goals to achieve. This is a $1.99 digital toy. Like a Tonka Truck for the iPhone.