It's nice, sure, but i'm a little underwhelmed.
The upgraded graphics is nice but i don't game on my macbook (i have a 2.4ghz blackbook) and it still doesn't match my desktop so any heavy lifting is better suited for that anyway.
Backlit keyboard -- looks cool but i don't look at my keys when i type so ultimatley it isn't worth anything to me
Multi touch pad -- nice touch, but, from my experience with the air, i don't really use gestures, being able to scroll with 2 fingers and click with 2 fingers is all i need in my touch pad
Aluminum body -- pretty..that's about it
LED screen -- brightness isn't an issue with my macbook so that isn't an issue, if it improves battery life that is nice (not sure what kind of improvement is expected?)
The new macbook is very nice, it will definitely bring in some new customers but there really isn't much besides a pretty case to make current macbook owners want to switch (except for those who just want the latest and greatest and that is really just an ego thing..)