I really don’t listen to podcasts much– I work with words all day, and I can’t listen to words and also write at the same time. I no longer have a commute, so I pretty much don’t have a lot of "downtime" for listening to text. This is also why I have an ever-growing list of unlistened-to audiobooks from audible.com.
However, I’ll give a warm shout-out to Damn Interesting because, even though it isn’t an RPG podcast, it is a fascinating history podcast which delves deep into a moment in history, and telling the story vividly. It’s a good source of strange little ideas to mine in a game.
Check it out. Sponsor it if you can.