A few little tidbits about Photopass for the newbies:
All of the PP photographers carry a supply of cards. However, you can put multiple pics on a card, so you don't need to get a new card each time you get a pic taken - once you have one, just hand it to the photographer each time you get a pic.
When you get home and log into your PP account (seting up an account is free), you enter the serial number of your card, and all the pics associated with that card will be added to your account. But you can add multiple cards to your account, so while you're at WDW, have each member of your family get their own card, and have them all swiped at each pic. This gives you redundancy in case someone loses a card, but also allows you to get individual pics if you split up in the parks. You can add the whole families pics to one account.
An account can have multiple cards - but a card can be added to multiple accounts, too. So if you want to share your WDW pics with Aunt Edna, and she already has a PP account, all you need to do is tell her the serial numbers of any cards you want to share with her.
Word on the Street (Main Street USA, that is) is that Disney is currently working to add ride photos to the PP system. At the moment they are experimenting with Test Track, but eventually they will have all ride photos accessible by the PP system.