Cracking screen, Grommit.

Aiming to put my iPhone in my pocket, missing, and then accidentally standing on it after it's hit the ground = not a desperately good start to the day.

Um.

Anyone know how easy it is to replace (or get replaced) an iPhone screen, or could this be the excuse I need to (finally) get round to upgrading from a 3 to a 4 (G or S)?