One of my new hobbies is watching a Charlie Chan film and then researching about cast members in the film using allmovieguide.com or Wikipedia. Introduces one to many interesting people, trivia, and careers I would have otherwise not known about.
If you are interested in actors lives, you should look at the adventures that Drue Leyton (London, Circus, and the lost Courage) had. I thought that I once read that she had even written a book about her time in the French resistence during WWII.