Sometimes I forget about the simple things that I use to stay current with Cisco technology. One of these 'tools' is the Cisco TAC security podcast.
This podcast is a great source of information if network security, specifically Cisco ASA based network security, is in your job description.
New podcasts are published, generally, on a monthly basis.
I definitely recommend adding it to your list.
Their site is located at http://tinyurl.com/securitytac