Layar is an Augmented Reality (or AR) application that allows you to progressively add new ways to use the app as you go in a number of different directions. Finding information and playing games are just the start.
TagWhat is based on a communications project that points out places to visit in a particular location. Once a place has been tagged, other users in the vicinity who use the TagWhat application can see it.
Yelp finally has an application that lets you find the addresses of stores, restaurants, and other such vendors in your vicinity. This is an incredibly interesting and practical use of AR, coupled with a very popular site/service.
WordLens is an intelligent example of how to use augmented reality: it will recognize a passage of text and translate it in real time into different languages. All you have to do is point your phone at the text for the translation to begin.
WorkSnug has taken a general principle from many of the applications found in this list and has come up with a new use for it: this application finds WiFi networks that are in proximity to your current position.
Although this is a paid app (the only one on our list that isn’t free), AR Basketball is very well-made. It uses a piece of paper that you need to print out, but it’s a lot of fun and you can score a ton of points. Give it a try!