The Secret Broadcast is a numbers station podcast. Every week a new episode is published. The content of the podcast is encrypted messages. You can submit a message and it will be read as an encrypted sequence of letters and numbers, and which can be decrypted with a key only available to you and anyone you share it with.
A group of dedicated gamers record some of their sessions of play in toto and publish them as podcasts for the rest of us to listen to. If you're not sure if you'll like a game, or if you think you're not running something correctly, see if they've run a session or two of your game and see how they did it.