I go to UC Davis and got the 13" uMB when it came out in Oct. It's been awesome. It is great because of the small desks we're mostly stuck with. And so there's a smaller tendency to have it wobble off. Another reason the 13" is a great choice is because of the lighter weight. I think it's 4 or 4.5 pounds, but a good pound less then the 15" MBP. And I always wanted the 15" for screen, backlit keyboard and sound. When I had the white plastic MB the speakers were so low. But now the new 13"MB even without grills since the speakers are right underneath the keyboard, and they're bigger, the sound has dramatically improved. and at the time I got the backlit keyboard, so that was great, and expose solves the screen size issues, trying to find things, and the new Snow Leopard Expose updated features will help too. I increase the fonts over most system preferences to forget I don't have a larger screen and it works! And like someone else said, a desk monitor is great to have. Hope that helps!
-Anthony
Univ. of Cali., Davis
Undergrad of Econ