I second Anne Mayhew's concern that plagiarism as property-rights 
violation has been over-emphasized. I frankly think it aggravates the 
student-as-consumer metaphor that haunts education now. We're working 
on a different approach to academic integrity here with our freshman 
seminar by framing the positive practices that students should be 
learning. Here's the overview:

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ACADEMIC PRACTICES
Academic work is devoted to pursuing, cultivating, preserving, and 
transmitting knowledge; it is similar to a very extensive and 
systematic conversation. Academic integrity consists of the virtues 
that support and nourish the conversation: accuracy, honesty, 
transparency, openness to questioning, willingness to communicate, 
and similar virtues. Violations of academic integrity thwart the 
purposes of academic work. All professions rely on these virtues and 
expect them of their members.

Plagiarism consists of representing someone else's words or ideas as 
your own, whether deliberately or inadvertently. It can take a 
variety of forms, and they all violate the norms of academic 
integrity, as do other actions like turning in the same paper for two 
different classes or cheating on exams. Avoiding plagiarism and 
maintaining academic integrity is accomplished by a set of good 
practices that begin with reading and go all the way through accurate 
referencing in bibliographies.

    * The good practice of reading means taking notes
    * The good practice of attribution means always making clear 
whose voice or idea is being presented.
    * The good practice of paraphrasing means to transform an idea 
into new phrasing, and nearly always means to digest and condense it 
for the purpose of connecting it with other ideas.
    * The good practice of quotation means both accuracy of form 
(including quotation marks) and aptness of selection.
    * The good practice of citation means clearly locating cited 
materials in their original sources.
    * The good practice of bibliographic entries means clearly 
identifying the information needed for others to find the original sources.

Paul Turpin