The latest aerial photo, for example, is meaningless to the uninitiated.

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An aerial photo on the web site of U.S. Sustainable Energy Corp. shows a plant in Natchez, Miss. where the company says it will soon begin producing 1.5 million gallons a day of biodiesel-like fuel from soybeans.

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Once the GPS data is linked to the pictures and prepared by a program on the computer, your trip can be shown as points on a map or aerial photo, with each point linking to a picture.

ENGADGET: GPS photo linking

Visitors can buy DVDs of disaster footage taken in the immediate aftermath of the quake: aerial before-and-after photographs of the city, and photo books that the vendors make sure to leave open to the most ghastly image of a half-dozen broken, gray young bodies, buried in the rubble.

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