Interesting thread on protecting your content. The lesson seems to be that DMCA complaints are a lot easier than hiring an attorney to go after some random webmaster.
I'm pretty sure I could find a few people using my content around the web. One day soon I'll start getting them banned from Google and letting their registrars and web hosts know what they're up to.
http://www.seo-search-engine-ranking.com/ad_network_222.php