I've spent quite a bit of time browsing Wikipedia, as I'm sure many others have. There's a seemingly infinite set of articles, each linking to related information. I began to wonder how I wound up on a given page and if there were any patterns in my navigation. To investigate this, I created a small Firefox extension to capture my navigation history when browsing Wikipedia. This provided the raw data I needed which I then post-processed with Perl to create a Graphviz dot file. The result can be seen in this example.
I'm not sure what I'll gain from this, but I'll look at the results periodically. If nothing else, I'll at least learn some relationships between articles that I would otherwise overlook.
If you're interested in trying it out, leave me a comment and I'll zip up the programs and add some instructions.