WIRED magazine published (Podcast Lectures 101) a few beautiful remarks on podcasting, a technology I have not experimented with, yet. In particular, it noted a high school history teacher, Lars Brownworth, who 
“Exhibiting an infectious passion for his subject, slashes through a dizying succession of wars, coups, and poisonings to bring Byzantium — the redheaded stepchild of empires — to life.” His website and podcasts on 12 Byzantine Rulers are available for free. It represents some food for thought on teaching, learning and multimedia.
BTW, WIRED also mentions the Computer Science E-1 course series podcasts published by graduate student-professor David J. Malan at Harvard. Another podcast to study.
