What do the colors mean?
blue: for links (the A tag)
red: for tables (TABLE, TR and TD tags)
green: for the DIV tag
violet: for images (the IMG tag)
yellow: for forms (FORM, INPUT, TEXTAREA, SELECT and OPTION tags)
orange: for linebreaks and blockquotes (BR, P, and BLOCKQUOTE tags)
black: the HTML tag, the root node
gray: all other tags
This little applet (click header) graphs your website. It's not exactly deterministic, but it's interesting to see it in context with others for sure: http://flickr.com/photos/tags/websitesasgraphs/
For somepeople they look like flowers, to be they look like atomic compound diagrams.