Cryptography show for ITR?

This week's NPR "Talk of the Nation/Science Friday" was on the internet. Both telephone callers, and internet "callers" were accepted. The show included the founder of Internet Talk Radio. There was a question along the lines of "how can internet mail privacy be assured?" Unfortunately, the experts only breifly mentioned public-key cryptosystems. I was wondering if they would go into a longer discussion about electronic privacy and crypto issues. I wonder if we could get a "cypherpunk" onto Internet Talk Radio to discuss cryptography and it's privacy concerns. Any ideas? -Thomas