Glass is significantly more durable than the current material used in the LCD screens. It’s almost completely scratch resistant and has a much smaller chance of getting punctured in some way. Glass is also a lot easier to recycle.
Another thing Jobs mentioned was that they’ve had overwhelming feedback about the glossy displays on the MacBook and MacBook Pro.
So, those things being noted, do you think the next revision to their Cinema Display line with feature glass screens? I know I love the sharper colors on my glossy MBP screen. It’d be nice to see it on a larger scale (say…a 30″ display?).