The scary thing was that it charged my credit card on file immediately after I clicked the "Get Started" button. I was pretty much expecting either to be asked to confirm my order, or to be told I wasn't eligible because I already had the relevant membership. No reminder to enter my password, nothing.
So, here's a heads-up and a warning. (You can get a 1 GB Nano by subscribing to Gold for 12 months, and a Shuffle by subscribing to Gold for 6 months.)