I thought the recall programme was open to all Apple customers with 1st gen Nanos regardless of extended warrantys/protection as the product has a known defect?
It is. See this link to get started with the return process.
I was sent the same letter after replying to the recall. I have never had any form of AppleCare for any of my Apple products and my 2nd Gen iPod was certainly way out of warranty. The serial number and my current address was all the information I had to provide.
I sent my beautiful white and chrome nano back to Apple after reading about the programme. To their credit Apple (Australia) made the process as simple as possible. Soon after I applied for a repair Apple sent me a letter which was barcoded. After that all I had to do was present my iPod at my local post office, they scaned the code, packaged it and sent it to Apple free of charge. After a couple of weeks an iPod was courierd to my front door.
However, they replaced the 2nd gen iPod nano with a new 6th Gen iPod nano which, though clever, is just too small for me. Fantastic service, BUT, I wish I hadn't returned it because I loved the design of the 2nd Gen and it held sentimental value. C'est la Vie !