DishLoc is one of a new breed of iPhone apps that takes you to a whole new reality. DishLoc lets you (through your iPhones camera and display) view where in your field of view the visible geostationary satellites are located. This allows you to easily plan your dish installation so you know exactly where you should place your satellite dish. It even tells you the azimuth, elevation, and tilt for each satellite!
You can purchase this app directly from iTunes.