Article: Their space: Gorilla Nation Media has become an industry leader for online ad sales.(News & Analysis)

In the past few months, Web advertising has broadened with the proliferation of file sharing sites and alliances of giants like YouTube.com and Google, as well as the shift to ad-based business models by America Online Inc.

By carving out slices of that broad market, Los Angeles-based Gorilla Nation Media has become an 800-pound gorilla in the digital jungle.

Gorilla Nation sells advertising on 400 independent Web sites in 30 categories. The rep firm aggregates traffic across mid-sized sites and then sells the package to national brand advertisers. In a typical month its sites attract 60 million unique visitors or more than one-third of the total U.S. ...

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