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A couple of years and many domain names ago I came across a cool java applet that took the web page you specified and turned it into a visual representation of how that page is structured and colour codes each node.
Several months ago the amazingly popular website Flickr opened up its service and functionalitly to the general public by means of an impressive API. Of course a large proportion of the internet users don't know what an API is never mind feel the need to use one.
Thousands of Flickr users have posted their favorite wallpaper photos. Some great ones on there that I use on my own machines! Take a look here.