Here is a link to a bit more about the series and book.
Update: Chaplin appeared on the January 21th program. If you are really interested in Charlie Chaplin or Buster Keaton, who also appeared on the same program, you should seek out the Unknown Chaplin series and Buster Keaton A Hard Act to Follow. The best series created on both. The Hard Act to Follow is a hard one to find, but a great one to have.
January 27, 2009 - The last of the six hour series will be this week. Check your local PBS listings.