At M.I.T., Large Lectures Are Going the Way of the Blackboard - http://www.nytimes.com/2009...
"Of the core science curriculum required of all freshmen, only introductory physics follows the new method, Professor Belcher said. Math, biology and chemistry are still taught through large lecture classes and small recitations." - David Lynch
they do use voting clickers, to show understanding (or not) of multiple choice questions, asked out loud. - David Lynch