"Thing 21: Discover some useful search tools for locating podcasts."

I was referred from podcast.net (not available) to podcast.com and found some interesting library related sites.
At "Meet the Author UK Podcast" I listened to brief book reviews presented by the authors including Islamic History: A Very Short Introduction by Adam Silverstein. "This book argues that it is impossible to understand the place of Islam in the world without knowing its history." The author pointed out that readers didn't necessarily have to choose his book but it was important for westerns to learn about Islamic history.

I also liked "Picture Book Originals". I explored Babette Cole's podcast where she promoted her book Princess Smartypants. You could see the book and hear her read it. Rosemary Wells was also a featured author. In addition to her artwork, book tours and exhibition dates were included. This podcast site promotes the purchase of "original artwork and giclee prints from the most beloved children's book illustrators".

I also explored the news sites including CNN News Update. It featured the recent death of author, J. D. Salinger and his works.

I used podcastalley.com too but I prefer Podcast.com. I found it easier to use and it has a broader range of subjects.