When I attended USC, my parents paid an arm and a leg for my tuition. They did whatever they could to send me there, I can't imagine how I'd ever disrespect a professor and thus basically disrespecting my family. We may pay tuition, but that never gives us any right to show a lack of respect to anyone, especially someone choosing to teach us.
Personally, I felt if I spoke to a professor often enough to the point of them knowing who I was, it actually helped my education. Obviously, I don't mean to say I tried buttering-up the professors of mine, but I showed respect, spoke to them during their office hours, and in the end, I think that furthered my education. I just can't see myself ever saying anything rude or nasty to a professor. I just think that gets you nowhere in the end.
I think with the way technology is going, notes on an iPhone are the way to go. If I was attending school now, I bet I'd see a lot of tablet laptops in classes, perhaps even some iPads, all being used for note-taking.