This short, wonderful video by Kate Burns is an excellent explanation of the history of Economics. In producing her video, Burns discusses the development of trade, cooperative behavior (an under-appreciated facet of markets in the discipline, at least as it's taught to undergraduates), the rise and fall of central planning, the answers to tough questions examined by macroeconomists, random shocks, and the rise of behavioral economics. Economics professors could use it as an introductory video in general survey or Principles classes. I especially like the quotes "Economics is a civilising force" and "Economics is amoral, not immoral."
The Story of Economics from Kate Burn on Vimeo.