Here's a clip of Trent Reznor discussing that song.
Johnny Cash - Hurt (Commentary by Trent Reznor) - YouTube
I had the pleasure of seeing NIN play Hurt live, and it is a moving song anyways, and then with the Johnny Cash video just puts it over the top. A great song written by a talented young(ish) musician, being performed by one of the most talented musicians of the 20th century....