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IMO screen protectors are absolutely useless on today's smartphones. I've never seen a bare screen get scratched unless under extreme circumstances that a Zagg or any other protector isnt going to help anyways.
That being said, i use one just because I don't like constantly having to clean my screen off. I use a antiglare/antifingerprint and love it.
Amazon.com: SGP MOTOROLA Droid X / Droid X2 [Verizon] Screen Protector Steinheil Series [Anti Fingerprint]: Cell Phones & Accessories
They cost $12 and you get two of them. Also, if you screw up installing them and get dust or permanent bubbles under it, they'll usually process a warranty replacement for it if you buy it direct from SGP store.
IMO, screen protectors are unnecessary. The Gorilla Glass on the X2 will be more scratch resistant than any screen protector you can buy.