In Pictures: Top 15 augmented reality apps for iPh...
Acrossair Augmented Reality Browser
Acrossair is the Swiss Army knife of augmented reality. When you hold your phone horizontally, it shows your location on a map, and you can select the layer you'd like to see. You can view cinemas, hotels, and many other amenities, check out geotagged Wikipedia entries, or see local tweets--you can even pin a location to find your car later. Once you've chosen a layer, simply hold your phone upright, and the full-screen camera viewfinder appears with overlaid information that pops up in see-through balloons as you move around.
In Pictures: Top 15 augmented reality apps for iPhone and iPad