My wife bought me the Marware (Anti-Glare) two pack from Kindle and I absolutely love it. I highly recommend these. They reduce the glare in all light conditions, make a stlyus feel more natural when using and reduce fingerprints dramatically. Get a set and you'll never go back.
As you can see from Amazons website, screen protectors are not everyone's cup of tea.
http://www.amazon.com/Marware-Kindle...ctor-Cleaning/