The first site that I showed in in class was a printing website called Moo. I thought it was interesting because it made use of php input fields to create business cards and also styled those input fields in interesting ways.
The second site that I selected is Hazelmail. It allowed you to updload your vacation pictures and create a postcard. It would then print it at the nearest printer and mail it for you. This was also an example of a site making use if php input fields.
The third site that I selected did not deal with input fields. It is for the Citizen's Band. I brought it in because I like the action on the site and it seemed to related in a general way to things we are learning.