Copyscape: Good Fun

This is pretty interesting - a site that goes and has a look to see who (if anyone) is stealing your content. Simply enter the URL in the search box, and click into the links to see the sites using your material - you can then decide whether to pimp slap them or not. I rather like the way it highlights your work on the page in question, too (note - you have to pay to see more results).

Linky.