Check out our Create story entitled How to Prep Your iPod for Armageddon. In it, you'll learn how to create your own iPod armor using 3M Scotchguard Paint Protection Film. If you have an (eminently scratchable) first-generation iPod nano, we've got even more help for you: a template that you can use to cut the exact-right size armor for that easily-marred 'Pod.
Download the first-generation iPod nano armor template here.
Links:
[1] http://www.maclife.com/article/prep_your_ipod_for_armageddon
[2] http://solutions.3m.com/wps/portal/3M/en_US/Scotchgard-PPF/Home/For_the/Consumer/Product_Info/
[3] http://dl.maclife.com/podplate.pdf.zip