Yep, I pre-purchased the CD and then registered the card that came with my
AAA packet. I then put the photopass card in one of the luggage tags that came with the packet...helped me keep track of it (it felt different in my pocket). We also used another photopass card when my husband and I separated to save a spot in a character line and he didn't have the original card with him. It's no problem, you just enter it when you get back.
Now, I have to tell you, I registered the first card about a month before the trip because I thought the "30 days" to view the photos didn't start until after the first photo was taken. When I got home and logged in, it said the card had expired or blah blah blah. I panicked, thinking my 30 days had started when I pre-registered the card. I used the contact email for photopass, explained the situation and the next time I logged on, I was able to access my photos! Whew! So, I'm not sure what the policy is, but regardless, I got the shots and the CD is being shipped as I type...