An HTML programmer called Sala published a tool called Websites as Graphs . It collects all the HTML tags from a web site and renders a graph based on what appears to be the density and distribution of tags. Is it useful? Well probably for HTML coders but it produces beautiful pictures that are reminiscent of fractals. Here's one of this blog:
And another of my book's web site.
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
grey: all other tags
Sala says that since going live over 500,000 people have rendered their web sites and there's a huge collection of them on Flickr here.