ShieldZone recently sent PSP Fanboy a sample of their screen protectors. They take on the appearance of a thin plastic film, and help protect it from the crazy things you do to it, you maniac. There are two variations of the product, one that protects the screen itself, and another that protects the entire face of your PSP. Personally, I'd have to recommend the screen protector over the face protector because the installation of the product, although simple, is also quite cumbersome. The film is very durable, but also incredibly adhesive, even to your fingers. It's incredibly easy to trap finger prints on the film, and distort the shield before application. The precision required for the full face shield is a bit demanding: it requires you to align small openings in the plastic nearly perfectly with the buttons on the system itself. This is where many things can go wrong in the installation.
Once applied, it takes a bit of effort to squeeze out the bubbles underneath. In the best of scenarios, your system will not have anything noticeable on it, but in the worst case scenario, very obvious bumps will be apparent. Problems should be minimized with the screen protector, as opposed to the body protector because the margin for error is much more forgiving. If you manage to install the product without a hitch, it is surprisingly durable and comes with a lifetime guarantee, which is pretty sweet. The screen shield is $13 on their official website.