This is actually pretty cool. Another great link from Dale Pike!
Technorati.com checks a boatload of weblogs, and maps the links between them. Feed it a URL, and it tells you who else links to it.
What a cool way to find people who are linking to (and, one would therefore assume interested in) the contents of a weblog.
Something like this would be a slick addition to CAREO - map which people are subscribed to a learning object, and perhaps which other objects they've subscribed to, generating some form of dynamic relationship between objects. Something like the Amazon.com "You might like..." feature...