i (rob) personally think that a good deal of Johnny Cash's best stuff was recorded in the twilight of his life, with producer Rick Rubin, including the recently released "Ain't No Grave". there was a music video made for the track, and some dude decided to artsy-fartsy-fy it up, and the result is almost more haunting than the song itself, if that was ever possible.
anyway, hope you enjoy it as much as i did -- unless you're an epileptic. then you're not going to remember it. you'll wake up in an ambulance somewhere, wondering how you got there.