I'm only a pre-nursing student, but thought I would chime in as a practically professional student.
I have started using my laptop to take notes in class. What I like the best is that I don't have to read my handwriting and it's great to make up a study guide for a test. You just cut and paste from your notes. It really depends on your laptop on whether it makes much noise. Mine is very quiet. The only time I make noise is when I accidently hit the wrong button and turned on my music player in class. Oops.

A couple of years ago I tried the whole PDA thing but found the screen too small. You really have to lean forward to be able to see the screen.
Even if you don't get a laptop, I found it useful to type up my notes after lecture. I did this for A&P and it was extra review. I know its alot to do and the only way to really keep up.
Malia