I had no idea, that's awesome! Anther shameless plug, but did you ever see our "Running Sucks," video/podcast? Check it out:
Do you ever do the "ultra" marathons? Those seem a bit crazy to me and not very good for your body. In fact, my guess is that anything over a half probably isn't the best for your heart/body. I could be wrong though. You're the expert though, what do you think?