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By Catherine Arnst
The Web is becoming one giant consulting room. A Pew Research Center survey found that 80% of adult Internet users in the U.S.—some 113 million people—searched for health information in 2006. Increasingly, they are moving beyond passive searches to interactive forums, blogs, and other social media, a trend often referred to as Health 2.0. Following are some of the most innovative sites on the World Wide Doctor's Office, arranged alphabetically.