This thing isn't cheap ($44), but it beats the hell out of my film protectors so far. It extends very close to each edge, and has some painted areas that prevent any "halo" effect due to the edges of the screen being curved. It works well so far with the cheap Obliq case I've got on it. Might try the Samsung case soon. Might not work with tight cases that extend over the bezel.

Also available at AT&T stores for $48.

Problem I had with a couple of film protector was that they'd get little dented pen trails from the S-Pen, which made my screen show a bunch of tiny worm trails in bright light. No good.