I used to refer to this site when I started Photography – Ken Rockwell
Great site for Fine-art Photography- 1X.com
Great site to get your photographs rated. My only complain is, unless you become their paid member, you don’t get many ratings – 500px.com
Another site where you can get your pictures rated – Pixoto
Resource page from F-Stop Magazine
The master of flash and image making – Joe McNally You will find his blog and tutorial very interesting.
Legendary Maestro Steve McCurry.com
Master of Portraits Gregory Heisler
Finest Architecture Photographer Jean Michel Missiri
Great Photoshop Tips and a great read Scott Kelby
AG Studio 