I hope you're still doing the podcast. I just discovered it.
I didn't go through the list so forgive me if these have already been suggested.

I would love to hear a series of episodes where Jim talks about his writing process and what specific structure his teacher had him use that led to Storm Front.

I would also like to hear some episodes specifically on world building and how he uses, and tweaks, classic ideas of mythological beings. I love the "Pokemon combined with Lost Legion and Big Trouble" story.

Also, how about episodes devoted to a specific character or theme in Jim's books?

PS. does anyone know of other podcasts devoted to authors. Specifically ones that they appear on. I know of Tracy Hickman's podcast but I don't really like it.  Also any on writing fiction. I listen to Writing Excuses (hosted by Brandon Sanderson, Dan Wells, and Howard Taylor) and The Dragon Page.