If you purchase a screen protector for your Droid DO NOT Peel Off the Protective Backing of the protector before you clean the screen. Any dust particles that come in contact with the exposed back of the protector between the time that you remove the backing and applying to the screen will show up as small bubbles or circles. Don't ask how I know.
I advise to clean the screen with the cloth that comes with the protective sheets. Then blow in the screen to remove any lint, then quickly remove the backing and apply the protective sheet. Do this in a dust free environment.