All of the mentioned podcasts are great, you'll pick up cool little tips that will help you with your own brew.
In the general "About Beer" category I have a few recommendations.
I recently listened to Beyond the Pale, which walks you threw the history of Sierra Nevada, I found it quite interesting.
I'm currently in the middle of a book called Fermenting Revolution by Mark Christopher O'Brien that is essentially a history book about beer. I'm a nerd for history, so I've really enjoyed it so far.