Basic brewing.com has some excellent podcasts, but this podcast on lagers is just excellent. The guest on this topic is Chris Colby, editor of BYO. http://media.libsyn.com/media/basicbrewing/bbr12-21-06.mp3
I have no affiliation with Basic Brewing or BYO.
I copy the mp3s to my mp3 player and listen to them in my spare time.
Getting back into brewing...
This is actually the first time I heard an American home brewer talk about "Spunding", a German brewing technique used to naturally carbonate during a secondary fermentation in a closed fermenter (keg in this case).
I told you it was a good podcast ! Basic brewing has tons of video and audio casts on a variety of subjects. They make for interesting listening and viewing.