www.tenminutelessons.com/lessons.html?e=38"Practical Preparedness" from TenMinuteLessons.com
Great way to introduce friends and family to preparedness. Each 'lesson' is ten minutes; you can burn 7-8 to a CD and hand out. Hasn't been updated in a while though...
The iTunes store has a couple of more that could fall into the 'survival/preparedness' category. Not technichally a podcast, but search for "Simple Survival Moves" which, IIRC, is a video series demonstrating various attacks and how to escape/avoid them.
"Assault Rifle Basics" is another vodcast (video podcast) that demonstrates various rifle systems and how to operate/function check.
There is also a podcast by a husband and wife that I would label as "urban survival" but the name escapes me - I'm at work but I'll check when I get home.