Google has started to offer U.S. marketers in its AdSense network the ability to field ads that expand to post additional content, including film trailers, video game segments or additional images of a product. The ads can be created by Google's list of approved third-party rich media producers, including specialists such as Eyeblaster, Pointroll and United Virtualities, along with its own unit, DoubleClick, and Microsoft's Atlas.

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