I know it’s not directly related to numismatics but I’ve just found that you can download ancient history lecture podcasts from UC Berkeley at Itunes. And they’re free! I’m currently virtually attending lecture course 106b on the Roman Empire given by Isabelle Pafford and I’m impressed. I never thought I could learn as much about Octavian and the 2nd Triumvirate on the Northern Line!
If you’re interested, it also appears to be available here: