Engadget points out a trend on professors banning computers in the classroom... and I think its a great idea.
When I taught my blogging class last year, I did it in a computer lab. All I heard while I was teaching was the clicking of keys... and I guarantee you they were not taking notes. (I know that because the two classes I took in computer labs were definately exercises in continuous partial attention.)
So this year, I'm in a room with just desks and I've got the computer and projector up at the podium. All eyeballs on me. I'm all for banning the cellphones, too.