Yelp EasterEgg: Augmented Reality on the iPhone

Tuaw posted information about the Yelp application for iPhone: after launching the app - on any screen - shake your phone a few times, and a panel will show asking if you want to enable Monocle. Then go to he screen with nearby point of interest, press the new Monocle button, and you will see camera pictures with attractions overlay - augmented reality. It is a little shaky, but generally works.