Checking for Plagerism

http://www.freetech4teachers.com/2011/02/plagiarisma-plagiarism-checker.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+freetech4teachers%2FcGEY+%28Free+Technology+for+Teachers%29&utm_content=Google+Reader

This article talks about a site that is free that can be used to check papers for plagerism. This would be an awesome resource for a Language Arts teacher.