David,
the reason i found your podcasts to be so superior to others is your ability to understand Bitcoin's technical intricacies and explain them in understandable manner. i've followed your explanations on the Bitcoin Stack Exchange in the past as well. so much of other podcast content is just hot air.
i think this is your niche and you should continue to exploit that to the max for people such as myself who really want to know the hard facts and learn something at the same time. i would also take the time to brush up on the macroeconomic reasons why Bitcoin was designed the way it was so as to put the technical picture into a complete economic picture as well. your credit card example from the past podcast was a good example of this.
