Richard A. Muller Professor in Physics and Senior Scientist at the Lawrence Berkeley Laboratory, podcasts one of his Physics for Future Presidents and Descriptive Introduction to Physics courses from his University of California at Berkeley campus classroom. These lessons stress conceptual understanding rather than math, with applications to current events.
Such a great guest speaker on-demand to enrich learning of future astrophysicists as well as presidents, including that 11 year old girl with a Tablet PC who has stars and black holes in her eyes as she prepares to attend Harvard.