I have recently come across a site that quickly helps you determine if anyone is stealing your site's content. Just for fun, I typed in the url of my highest ranking site. I was surprised to find that someone had taken the entire contents of my home page and was using it as hidden text on all of their pages. Needless to say, I have immediately emailed the offender and will take further action if he does not immediately remove the content. I let the thief know that if my content was not removed, that I would report his actions both to Google and to his ISP. Don't assume that your content is yours and yours alone. Go to www.copyscape.com and see if anyone has stolen your content!