DisneyOwl-
Carousel of Progress is similar to Hall of Presidents in that you sit in theater seats for a presentation by "automated people". (I don't have a clue if "automated" is the right word, maybe "mechanical" is better.) The seats actually rotate around the stage in timed intervals which allows you to see different sets of "typical" life in America through periods of history. (I believe its the turn of the century, about 1925, 1950 or so, and then the last which approximates today or the "near" future.)
My description does not do justice ... my family really enjoyed it!!! I had never seen it before last week because it was not in operation on our previous three trips. When I had asked about it in March of 2003 the CM told me it only opened in the peak attendance times because not many people seemed to enjoy it. We loved it!!