Gorilla Glass 3 from Corning will be unveiled at CES 2013 next week, providing 3 times the resistance to scratching or breaking. Here is a photo of my retina iPad 3 that I still use regularly, even though it is shattered. Haven't decided whether I am going to replace it or not, waiting for a jailbreak for my iPad Mini in iOS 6.
I would say that 1 out of 4 of my friends have a cracked screen on their iPhone/Android, but suspect that people take better care of their more expensive tablet.
Drop a comment if you have a cracked (or shattered) iPad that you still use.