Screen Protection

Hi. I'm new to having an iPhone (coming from a Motorola flip phone). I have my iPhone 4 and black bumper. I'd like to add screen protection, but don't fully understand the options. I'm confused as if some protectors may be bad for the actual screen and coatings on the screen... meaning those with wet application. The only thing I've heard of that's static and not wet is the Power Support one, which is not yet available. Suggestions? Experiences? Thanks!