Hello, Jennifer!
Pre-ordering Disney's PhotoCD is a great way to save money on your Disney PhotoPass photos!
Check out the specifics of a Pre-Order discount offer for Disney's PhotoCD, which will entitle you to all of the Disney PhotoPass photos in your Disney's PhotoPass account, at a savings of $50 at the time of this writing. This means that you'll receive digital .jps of all photos taken by Disney's professional photographers using the PhotoPass system. For example, as you walk up Main Street, U.S.A. in Disney's Magic Kingdom Park, you can hand your PhotoPass to any Disney photographer, who will then take a few pics of you and your family with Cinderella Castle gracing the background. You'll see Disney's professional PhotoPass photographers throughout the parks, so it's a great way to capture the most magical memories of your trip, without having to ask passersby to take an entire group shot for you. (And Disney's photogs really know what they're doing!)
Once you get home, you can peruse your pictures, and even customize them to suit your own needs, so your time in the parks doesn't have to be interrupted by checking out your photos. I'm planning on pre-ordering ours for our visit this summer!
Please send any additional questions you may have regarding your trip to Walt Disney World! I'd love to help!