The first "unofficial" augmented reality app to hit the iPhone app store is from Yelp, which enables you to view information about restaurants, bars and other locations, layered over a camera view of your street: "Social review service Yelp has snuck the first Augmented Reality (AR) iPhone app specifically for the US into the iTunes App Store. The undisclosed new feature allows iPhone 3Gs owners to shake their phones three times to turn on a view called "the Monocle." This view uses the phone's GPS and compass to display markers for restaurants, bars and other nearby businesses on top of the camera's view."
There are plenty more on the way. And judging by the look and feel of apps like Layar (not yet available for the iPhone 3GS), these apps will change the way you think about physical location and the Web.
This is a trend that definitely has legs, especially once Apple officially unlocks the door to the app store for AR apps.
[image: The Terminator's Augmented Reality via Mobitrends]