Another great podcast is the new show called Trails and Tribulations. It focuses specifically on ultra trail running. Thank you Kim and Andrew for your awesome contributions so far!
If you still crave for more, then you might want take the Jetpack Show into consideration. He seems to be the Lance Armstrong of agegroup triathlon: a testicular cancer survivor who started training after his miraculous recovery and finished an Ironman. It's a funny show, although it often sucks big time. Kim expresses it very well in the beginning of Jetpacks latest episode, Anti-Show of Suck: "Hey there everybody, this is Kimber from the Trails and Tribulations podcast, and you are listening to the Jetpack Show - and I'm really sorry."