Cool article about the use of wireless IM in lecture halls.  Noting it here for my own future reference as much as anything else...

In the Lecture Hall, a Geek Chorus. Enabling wireless technology in university auditoriums has led to a back channel of communication for students to reveal their thoughts. By Lisa Guernsey. [New York Times: Technology]

I love having an aggregator.  I never would have seen this without it.