I haven't listened to a podcast about webcomics in years, and I think those to whom I used to listen podfaded a while back. I'm certain that there are fresher netcasts on this topic, and I would certainly be interested in some recommendations.
As a former netcaster myself, let me tell you that we are almost always hard up for interviews. I did interview a novelist friend for one episode, and I think it meshed well into our overall show. Had a webcomic creator ever approached me and requested an interview, I would have grabbed that opportunity, dragged it home, and a put a collar on it.