I saw this on the Dr. Phil show and I bookmarked it for my own use. It is helpful in making sure that you havn't plagerized and to prove make sure your material isn't mainly from one source.

[www.turnitin.com]

So, how does one use it?

"All Turnitin students must be enrolled in an active class. To enroll in a class, please enter the class ID number and class enrollment password that you were given by your instructor."