Original iPod nano owners benefit from scratch settlement - The Unofficial Apple Weblog (TUAW)It was a pain to enter the serial number at the settlement website, I found it easier to read on the internal 'about' screen than on the back of the phone. Between re-entering the serial number and re-entering the Captcha  it took me five tries.
... Thanks to a now-settled class action lawsuit, nano owners who experienced the scratchies can apply for a refund of $15 (if the iPod shipped with a slip case, as later ones did) or $25 (for no-case shipments)."
You then get a printed form you have to mail in.
It's a lot of bother, and I wouldn't do it if I didn't feel that Apple has a nasty tendency to skimp on quality control. This seems to be the only way to keep them semi-honest.
 Much less useful than you'd imagine. It didn't work online. I think I squandered it on a 2nd generation iPod shuffle, which was (and is) a waste of money.
 Captchas are getting to the end of their useful lifespan; spammer neural network software is now better than humans at deciphering them. In fact, I'm soon going to have to start using that software to support my own (legitimate) Captcha entering.