i-nique Topcoat Advanced Screen Protector kit (Creative Zen) 4GB / 8GB
$6 plus shipping might seem a bit pricey for a single screen protector, but this isn't like those cheapie protectors you get in three packs.  This is a screen protector intended to last as long your Zen.  The plastic is thicker than the cheapies you might have seen at your local retailer which makes it very durable and easier to install (it won't roll up on you, and it can be easily peeled back during installation to eliminate air bubbles; more on that below).  I've used similar protectors on various touchs