splash Masque Clear Screen Protector for iPhone 4 4G  4S AT&T and Verizon (3-Pack + 2 Bonus Back Films)
The protectors are easy to apply, the hardest part will be removing all the dust particles prior to applying.  I tried the \\"shower\\" technique and worked fine.  No visible bubbles or trapped dust under the protector on the front, I was a bit lazier on the back, but my phone is almost always in a case so it's no big deal.  Nice that it comes with 3 front and 2 back protectors.