YellowPages.com

www.yellowpages.com

May page views: 193.8 million

In 2004, YellowPages.com was acquired by SBC Communications and BellSouth, two companies that have since combined under the AT&T (T) name. The directory of businesses has become a major player in local search advertising—a growing industry on the Web. AT&T recently launched versions of its directory for Apple (AAPL) and BlackBerry (RIMM) mobile devices.

Pictured: AT&T CEO Randall Stephenson