Making full use of the iPhone 3GS's GPS capabilities, the Yelp app which connects you to user reviews of restaurants, bars and other businesses has some nifty features. Monocle lets you point your iPhone camera's viewfinder in any direction for an "augmented reality" street-view version of nearby establishments. The Nearby feature shows you in both list and map format which restaurants are closest to you. Bookmarks lets you read up on the spots you want to check out, add them to your bookmark list and view their location too.