What is Plagiarism? Rutger's University's Flash-based online tutorial for students.
Plagiarism Test from Indiana University, 10 questions and a printable certificate.
Plagiarism.org at The Learning Center.
Plagiarism handout for students on how to avoid plagiarism.
Busting the New Breed of Plagiarist offers pointers on using search engines to detect Internet plagiarism.
Cheating 101: Paper Mills and You, a Teaching Effectiveness Seminar thoroughly covers the topic and includes sites that sell papers.
Cyber-Plagiarism: Detection and Prevention (Penn State) includes sites that sell papers.