Wow, I really have been away for too long. Some quality choons here, you people have what is called bloody good taste in music!
Re the Hurt cover, stunning. Packed full of pure emotion and Cash made the song his own, which is what you should do in a cover. Cash's voice you'd think isn't raw enough to cover a NIN song, he lacks the strength and power of a rock/metal vocalist. Didn't he write and perform this literally on his death bed?
One other cover you've all probably heard, if not you must do is below. One of the best songs ever written, if this song is not in your top 5, kick one of them out!
[youtube]Q1QKbgN1W7k[/youtube]