I drive and used to fly for work, and since I couldn't get my home radio stations with the show times I was used to, I got hooked on podcasts.
I am behind on most of them, but I make sure to listen to every episode. And yes, most are from Public Radio/BBC:
Business:
APM: Market Place Morning Report
APM: Market Place
APM: Market Place Money
BBC: Peter Day's World of Business
News stories/enviornment/analysis (not news casts):
BBC: From Our Own Correspondent
NPR: Story of the Day
NPR: Justice Talking
NPR: Science Friday
NPR: Living On Earth
NPR: To The Best of Our Knowledge
Entertainment:
NPR: This American Life
PRI: Fair Game with Faith Salie
NPR: Wait Wait Don't Tell Me
I am sure I have more, but those are the ones I remember
