From Inside the Box: TV News and Buzz Follow Zap2it:  'Who Do
You Think You Are?': Celebs discover their roots  who-do-you-
think-you-are-320.jpg"Who Do You Think You Are?" is first and
foremost a TV show, and thus it requires the presence of stars
and a story arc punctuated with dramatic moments, and it has all
those things.  But the series, which premieres at 8 p.m. ET
Friday (March 5) on NBC, doesn't necessarily need all those
things. In tracing their own roots, the celebrities who take
part in the show get to tell larger American stories, and that's
pretty cool even without voiceover narration and music cues.
"Who Do You Think You Are?" is executive produced by "Friends"
star Lisa Kudrow (who will be the subject of the March 19
episode) and based on a British series of the same name.
Friday's premiere features "Sex and the City" star Sarah Jessica
Parker, who had assumed that she was primarily of German descent
and that her family had only been in the United States since the
mid-19th century.  She discove