Duff-Man says...I thought there was somewhere on Apple's site where you could look up your product registrations but I could not find it now. If you call apple and give them the s/n of the iPod they should be able to tell you when it was registered....oh yeah!
What's weird is that I did "log in" to something that gave me the AppleCare serials but being on my slow-poke iBook, it wouldn't process it -- kept giving back a "try again later" page.