If your web site has quality, original content, someone is bound to steal it. That's just a fact of life in the Internet Age. Here's a great article which tells you what to do when your content is stolen. Also be sure to check out the second article, which tells you how to find out if your content has been taken. Their Copysentry service looks like a good way to protect your stuff.

http://websitecleanup.com/go/b8eac4