Betsy Bird has taken the leap - she's gone to audio. We can now listen to her awesome reviews along with reading them. She's got a good voice for podcasting and she sounds just as quirky as she reads - fun! (Mostly MG fiction.)
This brings up podcasts in general, and I'd be remiss to not mention some of my favorites. For those who love to follow authors on their book tours, go to Authors on Tour run by the Tattered Cover Bookstore in Colorado. These are mostly adult authors (clarification: people who write for adults rather than children), but they occasionally get some crossovers.
The Library of Congress' National Book Festival. These are webcasts rather than podcasts (you can see the authors), and they have a ton of children's book authors and illustrators you can enjoy. Check out previous year's shows too!
BEA podcasts. These also tend to include a lot of adult authors, but have some great panels and commentaries on the publishing industry. It's where I learned about BookTour.com where you can find out who's touring in your area and go see them in person!
Meet the Author Bookbites. More authors than you could possibly imagine doing private interviews. Very cool.
TeachingBooks.net does interviews with authors and illustrators (webcasts). Not all are free, but a few fun ones are - just to tempt you.
Kidvidlit. Okay, this one is rather new to me too, but it looks like a lot of fun. They're silly videos of authors and their writing lives. (Beware they take a little time to load and crashed my browser once.)
BookVideos.tv also has well done videos of authors talking about their books. (A whole section of children's book authors!)
Horn Book has decided to jump into podcasting as well and you can listen to their first foray: an interview with Jon Scieszka. They have a distinct advantage in their new venture - who wouldn't want to be interviewed by Horn Book? I long for the day when they knock on my door . . .
And last but not least, especially for the kiddies, you can see picture books read online by famous folks at Storyline Online. Very good.
Have more links to offer? Add them in the comments!