Keep iPhone clean with iPhone Fingers
Personally, I'm calling shenanigans on the whole thing– I've been using my iPhone for about a week now, and while my old Razr was covered in smudges and splotches by this point, the glass on my iPhone's front is clean as a whistle. A really clean whistle. Oh sure, there have been smudges– nobody's perfect. But anything I've seen on there has been easy enough to wipe off with just a smooth cloth. It's impressive, really.
Still, if you can't be too careful (and if these aren't fake, which I'm not convinced of), you can get 25 of them– in small, medium, large, and Wozniak– for just €9.90, or for €3, they'll send you five to try out. Because sometimes, even the iPhone needs "protection."