There was quite a moan when Apple introduced its new MacBook Pros last October — not over the lack of Blu-ray support or the price, but over the screen: new MBPs were presented with the glossy screen.
The missing alternative was the matte screen, which also happens to be antiglare, which the glossy glass LCD screen is not. For those who missed the matte, your agony is over, since Apple has added it back as an option for some of the Pros, depending on the size (albeit for an extra $50).
Whether you like matte or glossy usually comes down to what you're doing with your computer, and aesthetics — while I prefer the slick look of the glass (even the controversial corner-to-corner design), the matte screen does seem to be easier on the eyes.
What do you prefer?