i had my ipod out of a case for a week after i got it and it got scratched up pretty badly. then i got an invisible shield and a switch easy case and i havent had a new scratch on it since. my invisi shield has scratches on the screen though
The back getting scratched up is more of an issue if you upgrade frequently and plan on selling your iPod within a year or so to someone else.
Also, the back is not only shiny, it's very slippery.
I just installed the BSE skin to the back of the touch and it solved both problems. The film gives the back a slightly tacky feel that prevents it from sliding around and makes it less likely that it will slip out of your fingers and plummet to a concrete death. With it on the back also looks damn near perfect (couple of tiny air bubbles, but, so what).
I have previously used the Invisible Shield and got similar results but I have to say that I'm really impressed with the quality of the film and accuracy of the cut on this new iTouch skin from BSE it fits perfectly. Even my wife who doesn't notice such things said "wow, that skin thing you put on your iPod looks and fits great".
I second that emotion.who cares honestly.....it's the back