Penn State: Cyberplagiarism: Detection and Prevention
This site provides extensive resources regarding palagiarism and plagiarism detection, including links to paper mills and information on plagiarism detection sites.

University of Alberta Libraries: A Faculty Guide to Cyber-Plagiarism
"The purpose of this web site is to examine the issues of plagiarism and cyber-plagiarism and what faculty can do to prevent, detect, and report plagiarism."