Don't know if many of you know who Tegan and Sara are, but this was pretty weird to me when I found out about it. It's a good cover, though, and it does the song justice.
That Tori Amos Slayer one was the first I thought of. That entire album is covers and some of the others are pretty out there too, especially "Happiness is a Warm Gun."
I'm a huge fan of the version Pat Metheny did this year of "Sound of Silence" on his picasso guitar (weird harp/guitar hybrid with something like 42 strings). It sounds amazing.