The screen shot here is just an example of the coolness of this application for the iPhone. The Wikipedia links give information valuable to the traveler and tourist.
Google Earth lets people virtually fly around a 3D view of the world made from satellite and aerial imagery mapped onto the planet’s mountains and valleys. The iPhone version reproduces this core experience, downloading imagery from Google’s servers as the perspective shifts and dotting the map with landmarks, photos, and other information.
What is your favorite application for the iPhone, Treo, or G1 phone? Or what do you wish they come up with next?