I am probably one of the last ppl around to discover this, but ill post it here for the (probably) 2 other ppl in the world who have yet to stumble upon: Risky Business.
Its pretty hard to find good quality security podcasts without some pretty sad signal to noise ratios (or adverts on spinwrite) but risky business is def. a keeper..
i downloaded a few older episodes to help me through a long drive this weekend, and was very pleasantly surprised.. if u have not yet added it to your podcatcher.. u probably will..