I don't care about IM or email... I can't stand when people play video games - that *&^% is DISTRACTING and highly disrespectful.
I guess my classes are different than a lot of the posters' on this thread; My teachers test on stuff they go over in class. Thus, actively listening to the lecture portions of the class gives me another opportunity to be exposed to the material that will show up on the exam. I might zone out if one of my classmates asks a stupid question, or while a student is essentially reciting a case brief (facts/holding/etc.) after being called on. However, most of the time I'm pretty involved during class.
What are you guys paying 30k+ a year for? To not pay attention to the Profs that you're paying? I don't personally care what how you spend your money so you can take that as a rhetorical question