William Luther has put together an excellent list of Planet Money episodes that are keyed to the relevant chapters in Modern Principles of Economics. A similar list is also available for the excellent intermediate-micro text by Goolsbee, Levitt and Syverson.
For graduate students, Luke Stein has put together a 64 page “cheat sheet” (pdf) for basically the first 2 years of micro and macro theory. It’s not for everyone but would be great for studying for prelims at many top programs. This diagram summarizing key results in consumer theory was excellent.