Images: Microsoft's Virtual Earth 3D

Microsoft's Virtual Earth 3D, announced on Monday, allows advertisers to buy banner ads that float above buildings in photorealistic environments. The application, which downloads into a browser, melds together Virtual Earth's 3D features and Microsoft map and local search. In this screen shot, Zip Realty ads appear on virtual billboards in downtown San Francisco near the AT&T baseball park.

Credit: Elinor Mills/CNET News.com

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