Yelp, the popular review site with its own location-aware iPhone app, can get even more up-close and personal with its users’ takes on everything nearby. Download the app and fire it up, then shake your phone three times.

Now you’ll see the closest Yelp-reviewed businesses overlaid on a camera view, giving you that “augmented reality” all the kids are talking about these days. It’s a neat hack for hungry travelers, or a deadly distraction for those trying to skirt impulse purchase pressure.

We love iPhone apps like this, as they extend the iPhone’s functionality in new and interesting ways, and allow frequent travelers access to find places they normally wouldn’t go to in the first place.

This is one of the first iPhone apps to use this style of augmented reality, which isn’t really supposed to come of age until iPhone OS 3.1. Yelp doesn’t explicitly mention this feature in their App Store listing, which we’ll take to mean they’re still in the testing stages, we assume.