The "Security Now" podcast with Steve Gibson isn't too awful bad, geared more towards PCs, security, internet, etc. Like you say, at least it beats listening to the local radio stations.
Problem is I think Steve Gibson's tin foil hat is too tight. And it too is only once per week.
To the average person, everything he talks about makes it sound like everybody that's connected to the 'net is about to be hacked, everything everybody owns is about to fail, and everything he's developed is the greatest thing since sliced bread (e.g. The Portable Dog Killer, SpinRite, Shields Up!, etc.).
To the person that might know a thing or two about a couple handfuls of things or two, that same stuff is generally ho-hum and known to the community as a whole.