If your concern is over wasting the battery, it's not leaving headphones plugged in that does that (at least not to my knowledge). What I've noticed is that if you're in the native music-playing app (which I believe is the "iPod" process), if you don't exit the app by holding the goto-home-screen button down for about 5 seconds (sorry I don't know the technical name of that button that is at the bottom of the Touch), the process stays running in the background. However, I'm not sure that that background process uses up battery time. thorne