ABC news ran a story last week about lecture halls equipped with clickers similar to the voting devices used on reality shows. Now professors can tell who's listening, and if their lectures are confusing or not.
Sometimes, he says, the instant result is "gratifying." Other times, it's deflating. But at least he knows now whether to go over material he covered before, because no one seemed to get it, or move on.
Although I would take great pleasure to inflict my exact opinions on some of my undergrad lecturers (Query: how do you go lower than zero?), now that my turn to stand up there and drone is coming, maybe I wouldn't want to know....In the end, I think this info would actually be helpful.