oogle already has customized some of its Web sites for display on the iPhone, but now the company also dived headlong onto Apple's highly regarded mobile phone with a full-fledge application, a handheld version of its Google Earth geographical software (download for Windows and Mac).

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.

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