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Clickers allow teachers to poll attitudes, check comprehension, stimulate discussion, and more.  And everyone loves a toy!

(overview from Vanderbilt)

(beyond questions with a "right" answer, from Toward the Best in the Academy, a publication of the Professional & Organizational Development Network)

(Carnegie Mellon)

(University of Colorado Science Education Initiative provides this video)

(more than 280 entries on every conceivable topic from Derek Bruff, Vanderbilt)

(student response system that works with any internet-connected device, allowing multiple question types, quizzes, exit tickets, and more.  No clicker necessary because students use their own devices)

(classroom polls with images, equations, and more using student smart phones or laptops)

lets you convert existing slides into a presentation that allows student interaction and polling.