I dunno if there's been a thread like this, but hopefully not.

Basically, the idea is to post any awesome covers you've found that really do a song justice, or infact are better than the original.

I'll post a few to start this off:
Crossfaith - OMEN. (Prodigy cover)

I Fight Dragons - Rick and Mario. (Rick Astley/Mario mesh-cover.)
They also do the Zelda theme, you should check that out.

Most people should know this one anyway.
Metallica - Stone Cold Crazy. (Queen cover.)

I only really have one rule, and it's that it has to be a full cover, so things like guitar/drum covers of songs aren't allowed, but if one guy does a full cover then I guess that's acceptable.