The Great Dive Podcast is fabulous if you don't mind the colorful humor (I don't) and if you appreciate hosts who are extremely passionate and knowledgable about diving. If you are offended easily, probably you'll want to look elsewhere for your scuba podcast fix.
I listened to all of the episodes related to the David Shaw incident and those were especially good. I'm going backward in time so starting the dive tables episodes and so far those can be a challenge to get my head around as someone totally new to diving. I just keep listening and google terms when I need to, but these will be great to revisit as my knowledge grows.
If you have a favorite episode or series of episodes please share!!