Have you guys seen those IvySkin cases? Like, the whole thing is made of hard plastic even the part in front of the screen, so you need no screen protectors/films. They say it has some German technology that allows the screen to be controlled through that thick plastic.

Ok, anyway, question is, what if my iPod has already a plastic protector film, eg. Invisible Shield? Will I need to take it off or will it still work?