I second a lot mentioned already. "Hurt" by JC(that ought to tip Fisty over :D) sounded like a true song by someone who had BTDT, no whiny Trent Reznor industrial emo crap.
I'll incur the wrath of pure Metallica t-shirt wearers by saying I enjoyed pretty much the entire Garage Inc cover album. Besides "The Small Hours" and "Whisky" I also really liked their cover of Bob Seger with "Turn the Page."
Then again, after a 6 month cruise trapped in a shop with a Michigander who loved Seger and whatever that retarded card game is, anybody but Seger singing Seger sounds okay.
Shine Down sounds like Skynrd before Sknyrd went to crap.
I've heard bluegrass versions of "Unforgiven", "Am I evil," and "For whom the bell tolls." Pretty damn good.