Since I have an idea for my app to have an augmented reality map, i did some research on a few apps that use it. I really like the idea of being able to search the zoo in that view instead of using a key or a regular map it can pretty much guide you just by looking around as if you were looking out your own eyes. I think its better than the street view on Google map because its more detailed in where you are and where whatever you are looking for is located.
here are a few apps I found:
Golfscape GPS Rangefinder
Pocket Universe: Virtual Sky Astronomy