Click to read The 6 Steps to Stop Content Theft : The Blog Herald
From the article:
If you take a few moments to familiarize yourself with the process and technology, you can become a champion plagiarism fighter in short order and get back to the business of running your site before you realize how effective you’ve become.One easy way to determine if someone is scraping your site is to check your Feedburner Stats. Select the feed you wish to view. Under VIEW is the link for Uncommon Uses.
Click Uncommon Uses (it is a hyperlink) to view the list of uncommon uses. If you see an web site under Referrers that you do not recognize, click it and view the site. If you approve of the use, just check the box next to the referrer and next time you will realize that you have already checked the web site.
If you do not approve the use, you may take steps as outline in the article above.
I must admit that it is sometimes more trouble to try and get the website to stop it than it is just to ignore it. It is your choice. After all, it is your content.