By an interesting coincidence, I received a mailing from The Great Courses with a free sample lecture on the spread of language through Austronesia just as I was reading the chapters in Jared Diamond’s Guns, Germs and Steel on the very same topic.
The lecturer is very good and maintains interest on the topic but he is also using an overhead or projected presentation as he seems to pause to point or indicate features. I suppose this is one good reason to pay $400 to $1000 to take the real college class as opposed to getting just the lecture for $40 to $80.