The National Park Service creates neat two-minute podcasts about Yellowstone. Each video covers wildlife, scenery, safety, weather, history or some other park issue. Very entertaining, and can get you your travel fix in between visits.
You can view or download the podcasts from their website! You can also download a map that is numbered to correspond with the sites shown in the videos. (How cool is that?!)
I’m going to be up-front here… I stole the photo on the left from the park service website. My ipod is cooler.