Before you get seated you will get your picture taken with one of the Princesses. Once you get your "complimentary" photo package (while you are dining) you should have an envelope that tells you you can view the photos online. The Disney photopass number can be found printed on the outer edge of the larger photo. You can claim this photopass number and add it to the photo cd via
www.disneyphotopass.com. I did not realize this until I came home from our August 2009 trip. Luckily I did so I could add the photos to my cd.
The photopass photographer does not walk around the restaurant and take other pictures.
I also did buy the photo package from Chef Mickeys and the Tusker House and noticed you can do the same thing with those. Just keep in mind that these photo packages are on top of what you are paying for the meals. They are not "complimentary".