This is where Penn State distributes its Podcasts.

This site looks like an earlier version of the above PSU site, but with direct access to a couple of PSU's podcasts, including one for Research Unplugged that we could explore.

Then there's this article (sustmind 06 science podcasts.pdf) from The Scientist magazine on science podcasts.

This is a post from Slashdot.org:

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0theslashdot asks: "I'm working at a major university in the US, and

have been charged with posting pod-casts of class lectures on the

internet. The problem is whether or not posting the videos would allow

students to skip class and just download the lecture, instead. I guess

the problem is trying to strike the right balance between allowing good

students to take advantage of this resource, but discourage bad students

from staying at home all the time and watching all the lectures right

before the exam. So what methods can be used to provide these pod-casts

for the students who actually attended class? In terms of when the

lecture should be posted, what would be a good time-frame? Immediately

after the class? 24 hours? One week? One class behind schedule?"

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