BetterPhoto.com
The best photography site on the Web! Take fantastic online photo classes with world-class professional photographers, unite with fellow photography enthusiasts, or create a beautiful personal Web site like this.

Digital Photo
An excellent guide for digital photographers with free weekly tips and advice. Includes a weekly theme and contest for interested photographers.

Photographic Society of America
As noted on their website:

"PSA is a worldwide interactive organization for anyone interested in photography, be
they casual, serious amateurs or professional photographers. Individual, Camera Club,
Chapter and Council members are offered a wide variety of activities: a monthly
magazine, photo and digital competitions, study groups via mail and the internet, how-to
programs, an annual conference and a raft of other activities and services.
The Photographic Society of America was founded in 1934 to "Promote the Arts and
Sciences of Photography. There are members in all 50 states as well as 60 other
countries of the world. PSA Headquarters are located in Oklahoma City, OK."