I just learned of this podcast a couple of weeks ago: Ultrarunner Podcast. I've listened to 4 or 5 episodes, and the guys do a great job. My favorite interviews so far are Jimmy Dean Freeman and Sunny Blend, Sport Nutritionist, both of which I intend to back and listen to again. Just started listening to the interview Dr. David Hannaford, elite sports podiatrist and ultra runner. So far, also an excellent interview.
Leslie Living and Running Behind the Redwood Curtain -------------
Trail Runner Nation
Sally McCrae-Choose Strong
Bare Performance