This is what happens when you have professors totally unequipped to deal with internet access in the classroom: blocked wireless access. Not that it stops students from playing chess, sorting pictures or reading saved web pages while the prof drones on. What would I do? Well, first thing, I'd set up a backchannel, displayed on a screen in the front of the room, to focus students on what was going on. I'd set up a second screen and have someone Google-jockey. And my main screen would be showing more than just power point slides: it would be displaying student work, which we'd be discussing. The lecture? Captured, edited and then podcast, for listening prior to class. The Slashdot thread on this is pretty good.