And now for something completely different...
Thanks to Hali over at Living Out of Boxes, I found this awesome post at Pharyngula. I'm surprised no one has thought of this before. HTML is a hierarchical language, and therefore any web page is suitable to conversion to a tree. Color different tags and tag-sets in different colors and you get something visually meaningful. Coolness embodied :)
Anyway, here is the graph of this blog (prior to this post). Click on the picture for a larger version:
The branch on the bottom right-hand side is the sidebar, while each of the other clusters is a single post.