I guess Ill be the first to chime in with an actual SUCESSFUL attempt at laptops in class. Some tips for people wanting to take a laptop is that you should GET A BACKPACK and GET a 2nd battery! those two things make laptops so much easier to use. with a backpack, a laptop feels 100 times lighter than with a shoulder pack.
Over the course of 1 semester, I managed to take
52 pages of psych notes. 13,000 words in total. far more that I would have by hand.
Some advantages:
Work is a lot neater
Work is less likely to get lost
notes are searchable for a specific topic
fancy fonts and stuff
I type reasonably fast
my hand gets cramped less from typing than writing
Some disadvantages:
a lot of lecture halls arent designed for laptop use, often I find it better to use on my lap than on the desk
always chance of being stolen.
always chance of being broken.
easily distracted in boring lectures
Anyway, the real "killer app" for using laptops is when your in a Comp Sci class and you can actually program during the lecture, all the examples the lecturer is using, you can compile during the lecture and the concepts just work out a lot easier.
Also, its nice getting a crossover and *ahem* violate intellectual property... especially during an computer ethics lecture
The only time I have really watched a movie during a lecture is when I wanted to watch one with a friend.
Plus, I do all my programming on my lappie and its nice to have know I have everything at my fingertips rather than rely on the clunky lab machines (compile time is also cut in half

)
In case your interested, Im using a IBM A30 P3-M 933, 256MB RAM, ATI Radeon mobility, 20Gb HD, 2 batteries, 14.1" TFT running XP etc.