Don Swaim, host of the long-running CBS Radio show, Book Beat, has interviewed a butt-load of authors. Many of these uncut interviews are available online. Check out these interviews of genre authors:
I’m in the middle of listening to the Asimov interview as I type this. He’s talking about the history the sf field and his career and books. (He was scared of writing another Foundation novel years after having written the “last” one.) It’s really fascinating stuff. Check it out!