Here are a few illustration/comics/animation related podcasts I like to listen to. Chock full o' advice, tips, inspiration and entertainment, this kind of stuff can be good for keeping you company as you toil away on your next masterpiece.
(can also be downloaded and subscribed to via iTunes)
Escape from Illustration Island
Big Illustration Party Time
Chris Oatley's Artcast
Man Vs. Art
Visual Artist Podcast Network