The other day over on FB (yes, I occasionally haunt there, and no I will not friend you) a fellow mentioned this podcast called Tale of the Manticore as a good actual play podcast. I gave it a listen
I can honestly say this is probably the BEST AP podcast I have listened to. The author weaves a story around the solo RPG he is running/playing in such a fashion that the overall effect is quite engaging. He splits this up with sidebar discussions on the character backgrounds (including the badguys), rules he is using or choosing not to use, and house rules and his reasons for using them. He also, so far, sticks to Matt's Best Podcast Guidelines #2: Stick to around 30 mins or so, otherwise you are simply bloviating.
As I said, this is a solo game but he manages to use voices and actors for some of the other parts and this along with his skills at storytelling come together to make a podcast not only interesting but a great listen.
Give it a listen, you might enjoy it (click the link or image above to head over to the TotM website).