JupiterBroadcasting (http://www.jupiterbroadcasting.com) has alot of really good podcasts, it may not necessarily make you a better software engineer, but at the same time it just might.
I don't think podcasts alone will make you a better software engineer.
Most software engineer spend countless hours perfecting their craft, and forget about soft skills that will make you more "likeable" and will help you advance further your career.
I didn't ask for podcasts that will, by themselves, make me a better software engineer. I'm just looking for ones that are more productive than just listening to music in my car on the way to work.