The
Gizmodo review has a good summary of the real-world differences between the MB's and MBP's screens.
I looked at both this morning, and found the new MB's screen to be an improvement over the prior version's...but I have a feeling that the glossy finish and brighter LEDs are simply disguising what would otherwise be somewhat washed out color compared to my old PB, Cinema Display, and new 2.4 iMac screens. YMMV obviously.
At least for the 15.4" Pro models, they still use TN panels



A shame; the 24" iMacs use IPS panels and kick the snot out of ANY 24" standalone monitor, by far... Given the price of the Mac Pros, I was rather disappointed, but from a certain angle everything is passable. (the 17" units are also TN, so I wouldn't want to do anything major involving color or shadow detail on it... with 15.4, some photoshopping can be done but I wouldn't dare tinker with gamut or curve settings...

)
That's not to say it's a total wash, no pun intended; at "that" angle (about 110 degrees?), the colors look almost as saturated on the iMac, without much in the way of washout, color shift, et al...
Just about all laptops use TN panels anyway (probably for energy conservation reasons I'd guess), but I was expecting more from the current Macbook Pro series, especially given Apple's reputation in the graphics industry.



Still, TN is ubiquitous and I do believe it's because of energy requirements.
Could be worse though, and there's plenty I can do on my MB

that doesn't require intricate color modifying...