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UC Berkeley is offering university lectures podcasted, free of charge. They have quite a big selection of domains, from where you can download. I found particularly interesting the series of lectures posted under political science and I would recommend it to anyone interested in politics and especially to have an inside view of US politics. Alan Ross is the professor, but you won't hear him too much, because he has invited different peoples, involved in way or other in politics, to his class. To listen to it, you will need to have installed on your computer iTunes. The link for the podcasts is http://itunes.berkeley.edu/. You will have to click on "Berkeley on iTunes U" button and this will start up your iTunes, where you can download whatever lecture you find interesting. When I use Opera to access this site, every time I click the button to go to iTunes, it comes up some kind of message that Opera is unable to find so and so, I just click OK, and it works fine.