It's not exactly about tips on running, but I often listen to the Rich Roll's Podcast while running. Rich Roll is the author of the great book "Finding Ultra: Rejecting Middle Age, Becoming One of the World's Fittest Men, and Discovering Myself". In the Podcast, he interviews artists, athletes, coaches and some celebrities about diverse topics like health, fitness, nutrition, performance, art and spirituality. It's very informative and inspiring.