There are a metric ton of awesome videos on
http://www.bestofyoutube.com and I highly recommend it to anyone wanting to see any of the amazing videos on YouTube. I've got so many good videos I've seen, seriously, I can't choose a favorite. I'll just suggest the site which I've spent far too many hours enjoying.
This one just popped up today and I found it to be awesome even though the video itself is kinda lame in a few ways ... just put yourself in the shoes of the diver as he talks through the annotations
http://www.youtube.com/watch?v=x5DyBkYKqnMIf you've never seen the Evolution of Dance, it is that one that popped into my head so I guess it is a favorite
http://www.youtube.com/watch?v=dMH0bHeiRNg