I put this on my Blackberry Pearl when it was new, 2.5 years ago. Works great, hasn't peeled off, and the screen and body are fully protected. Would probably look brand new if I did peel it off! (I carry my Pearl in my pocket, no case or cover besides the skin.)
I got mine at a different site, Best Skins Ever. (Same material, cheaper prices!) They have a DIY piece for $7 (3.75"x9") that would fit the Reader screen just fine--and have enough left over for a phone or iPod screen. I'm pretty sure the Reader screen is about 3.6"wide, so a slight trim along the edge would be required, then cut the length. You can do this while it's on the paper backing to get the size right before applying.
Here's the site:
Best Skins Ever