I ran across a similar situation recently. It wasn't my website but I brought it to the attention of the website's owner. We had a discussion about it here:
http://www.yorkietalk.com/forums/bre...en-valley.html
If you read through the thread, someone did a "whois" to determine the owner of the copycat site, and part of that was an email address for reporting copyright infringement to the host of the website. Maybe you could try that also.