School of Education, Indiana University: How to Recognize Plagiarism

A tutorial with many examples, practice questions with feedback, and a test.
http://www.indiana.edu/~istd/

Plagiarism

College professor's tutorial explains what plagiarism is and why it is wrong, and refutes the excuses often used to try to justify it.
http://www.coedu.usf.edu/~dorn/Tutorials/plagiarism/plagiarism.htm

Purdue University: Avoiding Plagiarism

Designed to help writers develop strategies for knowing how to avoid accidental plagiarism. Available in printer friendly html and pdf versions.
http://owl.english.purdue.edu/handouts/research/r_plagiar.html

What is Plagiarism at Indiana University

The Indiana University definition of plagarism and an online quiz with 10 examples of student writing to judge.
http://education.indiana.edu/~frick/plagiarism/index2.html

Ten Big Myths About Copyright Explained

Clears up some common confusions about copyright issues.
http://www.templetons.com/brad/copymyths.html