In reply to OliverTelfor:
I have a Galaxy S2 with a Zagg Invisible Shield protector and a CaseMate Tough case.
Seems pretty robust - going on 2.5 years for screen and 2 years for case. The original Samsung case was brittle and bits kept chipping off.
The Zagg screen protector goes on wet and needs time (24h-ish) to dry out completely, or it feels "sticky" - good for lack of finger prints and bubbles, though. Still not as slick to the touch as some - wife has some self-adhesive film on her S3 mini, which is better. Can't remember what, got it from an O2 shop, anyway, pack of 2/3.
The CaseMate wraps around the edges and stops the film lifting, which is good. It does have a tendency to hook coins out of my pocket, though.
Outdoors, my phone has been upgraded from zip-lock sandwich bag to Aquapac mini stormproof case.
Camera has a Jessops own-brand film on the screen, so not much help.