I write The Unsung Joe, a blog detailing the lives and times of the most obscure extras and bit-part players from the golden age of Hollywood. When I watch old films, I find the people in the background just as interesting as the leads. In fact, in the case of some of the lesser productions, the background people are by far the most interesting part of the movie. Thanks to the IMDB.com and newspaperarchive.com, it's possible to find out a surprising amount about some of those extras - not all, or even most, but enough to have provided me with fuel for this blog for the past few years.
I also write Small Town Noir, a blog about the lives of people in mug shots that were taken in just one town, New Castle, Pa, from the thirties to the fifties.