I commute about 30 miles to work so I am a huge books-on-tape (now cd) fan. Seems to be that podcasts can work the same way so I'm thrilled to find so many book reviews. Guess I'm the last person in library land to know that Nancy Pearl has a book review radio show. I also found Nancy Keene's booktalks on podcast. I've used her compendium of booktalks since I became a librarian, and believe I even have a couple on her website.
Her RSS feed isn't set up correctly from her webpage, but here is a link to the page with the podcasts: http://nancykeane.com/booktalks/mp3/