I'm doing Computer Science at Uni, and I've been very pleasantly surprised by the seeming proliferation of Macs in the course.
Where I had expected to be the only one on a PowerBook, I've seen two other PowerBook users, two iBook users and a general lift in the reputation of Apple in a computer science crowd.
Yesterday I was told by one cocky Dell user (using the bottom-of-the-line laptop), "What? You use a MAC, HA!" to which the three PC-using people around him said "Uh, dude, Macs rock".
I've been very impressed.
I'm also doing Creative Arts majoring in Graphic Design and New Media, so yeah, Macs are used almost exclusively there.
The Apple University Consortium runs out of my University though, so it's naturally more centred on Macs than other Unis.
I impressed a friend in my C.S. lecture by needing to send an email to our tutor, and simply switching on my AirPort card, opening Mail and typing the first three or four letters of the tutor's name, which got dynamically searched in the University LDAP staff database. It's something that you can do on a PC, but it's just never so easy, so intuitive.
He's now a Mac fan and looking seriously at the 12" PowerBook.
Having the Unix core available to me is very, very good in C.S., where everyone on their Windows notebooks are opening Cygwin (a Linux emulator), converting carriage-return and linefeed statements for Unix submission, etc, etc.
Macs are being very seriously regarded by most people I've seen.