Popes and the Papacy: A History

By a wide margin, this is my favorite course by The Learning Company so far.  In 24 lectures, Prof. Thomas F. X. Noble of the University of Notre Dame goes through the history of the papacy from its origins to the present.  He's by far the best presenter I have yet seen in these lectures, and I found myself repeatedly just enthralled by the stories he was telling about a particular period or individual.  (It may also have had something to do with watching a number of them in the study late at night fortified with a good glass of wine).
It's obvious that I learned a great deal, of course, but I also enjoyed it immensely.