The Volokh Conspiracy
Mostly law professors | Sometimes contrarian | Often libertarian | Always independent
New Free Speech History Podcast (First Episode: Ancient Athens)
It's by Jacob Mchangama, and presented by (among others) the Foundation for Individual Rights in Education.
Subscribe to it, as I have, via http://www.freespeechhistory.com/; I listened to the Ancient Athens episode (the only one out so far, besides the introduction), and found it very interesting. Mchangama is a Danish human rights lawyer, who has worked extensively on free speech and who has taught international human rights law at the University of Copenhagen.