You've probably already seen it, but I thought it was cool enough to spam the list:

http://xkcd.com/c195.html

Somebody should tell the artist that no blocks were ever SOLD DIRECTLY TO CORPORATIONS AND GOVERNMENTS. Also, considering the number of pixels in that image, you could really drill down to much more detail if you would use color coding for regions, multicast, and pre-CIDR blocks. --Michael Dillon