This term has not hit wikipedia yet.
UPDATE: 16th November 2007.
It has now. http://en.wikipedia.org/wiki/Classroom_Performance_Systems A very poor article, needs editing.
A quote from http://www.abdn.ac.uk/~clt011/prs/
New technology as demonstrated in the "Ask the audience" option of "Who want's to be a Millionaire?" now allows the lecturer to engage in a form of conversation with very large numbers of students simultaneously. Indeed, research and practice has shown this form of interactive lecturing to be so successful in certain types of lecture that it is being taken very seriously by Higher Education Institutes around the world.
Also known as classroom response systems (CRS)
The Vanderbilt List
Comprehensive list maintained by Derek Bruff
. . . bibliography of articles on classroom response systems (CRSs). Most of the articles present some form of research on the effectiveness or impact of CRSs on student learning. The first group of articles are not discipline-specific; the later articles are grouped by discipline.
July 2008: http://www.sciencedaily.com/releases/2008/07/080717092033.htm
Students Who Use 'Clickers' Score Better On Physics Tests
Resources on creating questions, research and practice ideas . . .