splash Masque Clear Screen Protector for iPhone 4 4G  4S AT&T and Verizon (3-Pack + 2 Bonus Back Films)
because it took me all three to figure out how to apply it without trapping bubbles or dust! Once I did, though, it looked great. I would be very careful to (a) clean screen first, (b) try to apply in a dust-free environment, and (c) adjust/practice positioning before peeling off the first mask, so you can apply it as quickly as possible to avoid trapping dust on the film.