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My feeling about portable gadgets like cell phones, MP3 players, and digital cameras is that they're meant to be used, and that means getting scratched sometimes. I don't mind if there are some scratches on the casing or LCD. So I don't bother with protectors or bags for my portable gadgets.

You will want a case for the newer IXUS models as they're made out of something called "Celabrite" which marks very easily. I've got black smear marks on my S500 from where it was rubbed against something which I can't get rid of.