Carl Jung is perhaps too easily overlooked in undergraduate teaching. Because scientific psychology, as well as traditional psychoanalysis, tends to devalue anything vaguely mystical, spiritual, or "transpersonal," Jung's work becomes a prime candidate for scapegoating and neglect. Precisely because Jung focusses on dimensions of human experience that are not readily explained by or amenable to more conservative perspectives, I feel his work needs to be explained fairly and accurately to undergraduates. Concepts such as synchronity, archetypes, the collective unconscious, and anima/animus are not just fascinating, but powerful in their ability to capture aspects of the psyche not fully explored in other theories. And I believe this is true even though recent research by Richard Noll (The Jung Cult , Princeton University Press) suggests that Jungs motives and methods in developing his theory may have been far from pure.
Jung's ideas have been particularly useful in the I Ching, Imagined House, and Shadow exercises that I use in class.
For an excellent collection of web links related to Jung, see Matthew Clapp's site located at http://www.geocities.com/Athens/1581/jung.html
Drawing from the psychology graphics library at Sonoma University.