I’ve been a listener of Security Now! since Steve Gibson and Leo Laporte since its beginning in August of 2005. I’ve never really been the type of person to "testify" to anyone else, but I do find myself saying frequently saying "let me tell you what my last week has been like."
Such is the case for Security Now! I find myself using it as an ongoing resource for both my graduate studies, and as a resource for my work. Steve Gibson has a way of presenting ver complicated issues in information security in very approachable ways.
It seems to me that I find myself going back repeatedly to refer and catch up on material I’ve missed. I recommend Security Now and all of the TWiT (www.twit.tv) netcasts if you’re involved in technology at any level.