The Wall Street Journal carries a fawning review of one of my favorite companies, The Teaching Company, the modern incarnation of the Lyceum Movement. The length of the lectures and the level of engagement required is pitch-perfect. I've had particular luck with the music courses and the history courses, but the only reason the literature courses haven't worked as well is that I rarely have had time to read the books.
The bus ride has been devoted to CFA studying, in fact it has become a primary reason for taking the bus when I can. Although come to think of it, that course on Byzantium is probably the ideal accompaniment to floor tiling.