I've gone back and forth on listening to music while running. For years I never did, then there was a period where I never set off on a long run without the ipod shuffle stashed on my pack. Even though I rarely used it for the whole distance I'd often stick some music on towards the end.
Currently I'm into podcasts. My favourite listening right now on a long run is from the Long Now Foundation. Their podcasts are excellent - good speakers, interesting topics and they are long! I didn't quite make it through two today, on a three hour run. Good stuff.