I'd say go with the MBP. I am!
I love how the Michigan crowd is all over the mac thread.
I've had a 12" Powerbook for four years (It's not cute. It's compact!) and it's still going strong, which I know has something to do with the extra several hundred I coughed up to enhance the RAM, etc. when I bought it.
So, I'm definitely going with the Macbook Pro for law school.
I am just going to quote from this thread on McRumors a post strongly in favour of MBP:
take from it what you will - it seems those who chose MB are quite happy with their choice, but as are those who chose MBP. I personally am leaning towards MBP.