Hm, the formatting on the PopSci page seems to be freaking out on me - I'm just getting giant fonts. True to their name, they seem to be mostly focused on "pop science" podcasts though. Of the ones on their list, Nature Podcast is about the only one I find worth listening to. I'm even considering giving up on Science Friday, because by the time I hear a topic in watered-down form on there, I've usually already heard the more in-depth story elsewhere two or three times...
I've already my long list of favorite podcasts a couple times before. Just wanted to mention one awesome new hardcore Synthetic Biology podcast I found: GeneMods
Patrik