Plagiarism Today has some excellent sample letters you can send when defending your copyright. Start with th Cease and Desist. You can the move forward with a DMCA Notice to Host and search engines. Check them out here and modify for your own circumstances.
While you’re there check out the rest of the site. It’s an excellent resource on content theft, copyright infringement and plagiarism.
Upcoming:
-Step-by-step guide to completing the Trademark Application for a portrait photographer
-Talk on Content Theft