For several years now, About.com Cats has featured a Cat Picture of the Week, and this year is no exception. Photos are chosen from submittals to the featured month in the Cat Monthly Picture Calendar Guide). All the Show and Tell picture galleries include an online form, where you can fill in the form and upload up to two pictures of your cat.
My criteria for selecting Cat Pictures of the Week include the quality of the photo, and the care in presenting the "story" behind the cat. Although exceptions are made, I prefer photos where the cat appears alone, rather than group photos.