Well, these noticeable scratches have got to go. I think I'm going to use
Displex, which, based on what I've read elsewhere, has had excellent results. Though I will stop using Windex to clean my LCDs from now on.
Meantime I've found a handy transparency printout for the 6000 that someone was kind enough to make. Just put a thin piece of transparency in the printer, print out this PDF image, cut along the lines, and then place the new protector over the display. I've attached in it case someone else would like to use it. This should tide anyone over until they stumble across "clingy" display protectors that fit the Z.