I have been listening to Kieron Gillen's podcast, Decompressed. It is, without a doubt, the best thing I have ever heard on the craft of making comics.
It is a writer talking to other comics creators about the craft of making comics. I have heard some good writing podcasts where a writer simply gives advice, or podcasts where creators tell stories from behind the scenes, and there are others (like ifanboy's Make Comics)... and they are great. But none of them do what Decompressed does.
Decompressed is comics creators discussing the application of theory to the craft of making comics. Form first-day novice to Comics Grand Champion, you have something to gain from discussions like these.
I wish there were new ones every single day.
If you make comics, go listen to these. -Josh