http://www.grc.com/securitynow.htm
edit: and for completeness -> www.twit.tv (choose the different (talk)-shows that are available to listen to, mostly IT related, and live.twit.tv/# for the live and/or prerecorded shows to watch. Security Now! is something I've enjoyed in the past already, but windows weekly from the (probably to us all) well known Paul Thurrot is new to me, and also has educational and entertainment value.
I thought I had to add that one to my tip, since that will give the ones who are interested in that sort of stuff a larger variety to choose from, which usually is a good thing.
Have fun!!