Re:Been There, Done That (Score 5, Interesting)

A class I took briefly did something similar. Students could post questions on a messageboard during the class, which TAs could then answer. We could also rate the lecture (anonymously) as it proceeded, and when it reached a certain threshold, a bell would sound indicating to the lecturer that his lecture was a) supremely boring or b) supremely interesting. I found it quite a novel concept :)

He would also call on people in the class to answer questions, and did this by randomly pulling a name from the database of students, and displaying the name in huge letters on the massive projection screen at the front of the lecture hall. Slouching at the back of the room hoping to avoid being spotted and questioned? Completely ineffectual!