The perfect complement to a Mad Men addiction? AdViews, a recently launched online collection of TV commercials from the 50s through the 80s. The ads are part of the D'Arcy Masius Benton & Bowles Archives at Duke University. The agency (and its predecessor, Benton & Bowles) either made or collected the material and all the ads are viewable via iTunes and can be downloaded for free.
Watching these makes you realize how far our commercials have come, for better and worse. Take for instance the evolution of the beer ad. The still above is from a 1950s specimen which uses a barbershop quartet in English riding gear to (unironically) peddle Carlings Red Cap Ale.
SO many more amazing examples here:
http://library.duke.edu/digitalcollections/adviews/
including the interesting creative decision to give Elsie, the Borden's Milk cow, a man's voice...