DOC cop - Submit students' papers to check for plagiarism. Free.

Plagiarism Workshop - Unit lesson plans created by Northern Valley High in NJ. Ready-to-use plagiarism lesson plans great for high school.

"You Quote It; You Note It!" - Fun animated tutorial about citing sources & plagiarism. Aimed at college students, but could be used for middle & high if teacher provides some explanation.

Exploring Plagiarism, copyright & paraphrasing - 3 lesson plans on plagiarism & copyright from the NCTE.