If you are in IT in any way, or have even a little propeller on your hat you should be listening to Security Now. Recent episodes have been explaining and covering thoroughly the mechanics and issues arising from the US government internet surveillance program. It can get a little heavy technically at points, and I am glad I did networking at college once upon a time..but don’t let this put you off. You won’t be the first or last person to rewind and review parts of an episode. its well worth the effort.
I’ve included the video in my post, but I think its best consumed as audio – you get get it from iTunes or the link above.