I think this is a pretty good set of graphics (I made it one here) from http://fantasticlife.posterous.com/amazon-and-the-reintermediation-of-the-specta
from http://fantasticlife.posterous.com/amazon-and-the-reintermediation-of-the-specta from http://fantasticlife.posterous.com/amazon-and-the-reintermediation-of-the-specta