Phone Devil Magic Screen Protector
http://www.amazon.com/gp/product/B003VPT5U2
I have used a number of screen protectors and this is one of the best ones so far (from the 20 in a pack for 0.99 cents to the military/space grade ones). The anti-glare feature doesn't get any better than this. The other product that looks good too is the Power Support screen protector. However, the PhoneDevil/MediaDevil are a better bargain. I have the Power Support anti-glare on my iPad and the PhoneDevil/MediaDevil on my iPhone. After installing both I ordered another pack of the PhoneDevil/MediaDevil for my wife's iPhone and for 2 other iPads that we have. I use my iPhone/iPad to process credit cards and customers have to sign on them. It is nice to hand them the gadget without tons of finger prints on the screen. It is also easier for them to see outdoors.
As with any screen protector, the key is to ensure the screen is clean. I recommend that these are installed in the bathroom. Let the hot shower run for a bit so the bathroom steams up. Once the steam has cleared, clean the screen as noted in the instructions. Don't be in a rush. Take your time. Also, use the card provided to remove any bubbles.