Recently i ran across some very helpful videos presenting metaphors explaining what is "wrong" with the economy right now. I thought they were very good, and found first heard about the people doing them on Presentation Zen.
I think that the biggest issues creating the economic crisis are greed, foolishness, and fear. But the things that are described in these videos by Marketplace Senior Editor Paddy Hirsch do a great job of quantifying at least the greed part. They are really simple to understand and put the crisis in terms that non economically gifted people can understand.