Wow Dave, Angels is amazingly well done, and a great song to boot. 300 vs Anchorman is also well done and funny.
Here's my addition, ok, I'm not a huge Xena fan, but Talvin Singh's Butterfly has to be one of the most amazing songs I've ever heard. So I'll use this as an excuse to play it for y'all!
http://www.youtube.com/watch?v=EqfeUPzjBac