Podcasting is a medium about which I know very little. My experiences with it are limited to being a guest on a couple of them. However, a lot of people enjoy them, so I thought I'd pass along a link to one specifically dedicated to AD&D. Called Roll for Initiative, new episodes are posted regularly and focus on a variety of 1e-related topics, with a special focus on the Greyhawk setting.
If you have some time to spare, drop by and give it a listen.