I'm using the Steinheil Anti-Fingerprint screen protector, and love it!
I had previously used the Seidio screen protector, and while I liked it, I was always wiping the smudges and fingerprints off of it. It also didn't wipe off as easily as the naked Droid screen.
Well, I broke down and purchased these...
SGP Steinheil Anti-Fingerprint for Motorola Droid A855
They're out of stock right now, but keep your eye out, or search to see if somewhere else carries them.
They are AMAZING at keeping fingerprints off of your screen! It really was the only thing that bugged me about my droid... the device looks sleek, modern, but the screen was covered in smudges....
Might sound a little compulsive (not like you can't use the device, even if it has fingerprints all over it), but....
By the way, these go on very easy, and don't require water/soapy liquid to install! They have a film backing with a tab, for easy removal right when you're going to install it, and it comes with a micro fiber cloth to clean your screen, and a plastic squeegee to get out bubbles during installation.