I know there was a thread about how "bad" YouTube is so I thought I'd point out two good videos on there:
http://www.youtube.com/watch?v=BfqYUpe9WcE
http://www.youtube.com/watch?v=pWcxLacr51U
http://www.youtube.com/watch?v=BfqYUpe9WcE
http://www.youtube.com/watch?v=pWcxLacr51U