Ed Summers has done some nice analysis of the top hosts referenced in article space, based on SQL dumps:

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)

See also his linkypedia code:

-Jodi