Simple apps are often the best and most useful which is where the app LocOn comes in. It is an app where you can do a contact search by location. The app grabs all your contacts and their addresses and then displays them on a map. Pretty useful if you are visiting somewhere and would like to know who lives nearby. When doing a map search, each pin represents a contact, clicking on them brings up their contact details.
A simple app with a useful function to find friends, family and contacts. LocOn can be downloaded on the App Store.