By the way, Pogge also has recordings of some of his lectures available as mp3. Astro162 was especially interesting, and also goes into more detail on the effects and implications of relativity.
Lecture Recordings: http://www.astronomy.ohio-state.edu/~pogge/Ast162/Audio/
Lecture Notes: http://www.astronomy.ohio-state.edu/~pogge/Ast162/index.html...
I hope he does some videos at some point.