I found two youtube clips on Khoa's Blog and I really like it. They are two parts of a video named The Crisis of Credit Visualized.

It's very interesting no matter what you already knew the source of 2009 crisis. And it easy to understand. You can find HD version on Vimeo. It's quite better to view it on HD :-D

[video:http://www.youtube.com/watch?v=Q0zEXdDO5JU]

[video:http://www.youtube.com/watch?v=iYhDkZjKBEw]