NBC renews "Who Do You Think You Are?," a program hosted by Lisa Kudrow that traces the ancestry of famous people.

"Who Do You Think You Are?" has performed well on Fridays, a night where the bar is definitely lower. Last week, the show actually beat CBS' "The Ghost Whisperer" in adults 18-49. Currently the show is averaging 6.8 million viewers and a 1.6 rating in the demographic.

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