Ed Summers has done some nice analysis of the top
hosts referenced in article space, based on SQL dumps:
http://inkdroid.org/journal/2010/08/25/top-hosts-referenced-in-wikipedia-pa…
People with more in-depth knowledge might make something of this -- for instance the
importance of bots in external links, or the prevalence of certain types of information.
For instance, why/where/how is
edwardbetts.com used? (doesn't seem to be postcode
data, which was my first guess)
Enter the title of an article and it will find other articles that could
link to it.
For an example see this: