Not a podcast, but something you should absolutely listen to if you haven't already: Bill Bryson's A Short History of Nearly Everything http://www.amazon.com/

Not a podcast, but something you should absolutely listen to if you haven't already: Bill Bryson's A Short History of Nearly Everything http://www.amazon.com/Short-History-Nearly-Everything/dp/0767908171 http://www.amazon.com/Short-History-Nearly-Everything/dp/076... It's by far the most entertaining, enjoyable, and well written science text I've ever read/listened to. You can download it on iTunes -- go with the unabridged. I listened to the abridged one first and liked it so much I downloaded and listened to the unabridged one... twice. And then proceeded to listen to four of his other non-science books. Get on the Bill Bryson train. You won't be disappointed.