I found the podcast on Rose Greenhow to be the most interesting. Not because it had very elaborate and scientific ways to encrypt messages but for the exact opposite. I was amazed by the simplistic ways she found to encrypt messages while living in the Union capital of DC. Sending messages by sewing different colors into quilts and using her daughter to relay messages from their tall tree all right under the noses of the North. The hidden messages in braids of girls and the insoles of couriers were so simple yet hid messages for many years.
One way the podcaster made the podcast rather interesting was that he centered the story around little Rose instead of a history lesson on the older Rose. Also the music in the background keeps the story from being very monotonous and he also included sounds such as gunshots and other sound effects.
All of the documents used to make this podcast were cited below the actual podcast and he described how each one helped and which ones were the most helpful. Also the music is given a title and musicians name. After listening to this I would start my podcast with brief background focusing on most recent and most interesting items. I would then move into the actual cryptography behind my topic and how that has been or affected cryptography today. I would also try to find music that would play off of my topic and enhance the experience.