Patrick Winston is a professor at Harvard who gave a great lecture on how to give a great lecture.
He emphasizes how to start a lecture, cycling in on the material, using verbal punctuation to indicate transitions, describing “near misses” that strengthen the intended concept, and asking questions. He also talks about using the blackboard, overhead projections, props, and “how to stop.”
I was reminded of this after seeing some 404 errors in my server logs to a podcast version of the videos I put together, but forgot to transfer to my new server. To download these into iTunes (and onto your video-enabled iPod), go to the Advanced menu, choose Subscribe to Podcast and enter: http://phiffer.org/etc/how-to-speak.xml