This guy has put together a nice way of finding and then telling copyright violators of his website to cut-it-out. He finds plagiarism with Copyscape.com and then sends them a DCMA take-down form-letter.
This works even if your site is Creative Commons Attribution… If they don’t give you attribution, it’s still an enforcable copyright violation.
I came across this because I recently found a bunch of spam sites using my content. Apparently webkinz are very popular among the spamming set these days. After posting about them, I’ve gotten several spam pingbacks. It’s not really worth it to me to follow up with DCMA notices to spammers because they’ll never get any Google Juice from me and I know fighting stupid Nigerian and Indian spammers just takes me down an endless hole. But there’s some info for you.