Inside the Actor's Studio: Harrison Ford
I've seen many episodes of this show, but Harrison Ford's interview is up at the top of the list as far as content and honesty. I have learned little things from others' interviews, but it seemed like almost everything he had to say was something I could use as I pursue acting as a career. Ultimately, I think the thing that floored me most was his humility, a characteristic not often demonstrated by actors and others in 'the business'.
This one's under 'Keep until I delete' on my TiVo.