Yet another interesting site about photography – PhotoZone.de. Despite the .de domain it’s mostly in English. There are a lot of articles about usual subjects – equipment, techniques, digital, etc. There is also a forum for those who’d like to stay and ask questions. Most stuff is basic, but it’s rather useful anyway.
If you don’t know where to start, go to Techniques section and see how easy it is to calculate “The Golden Mean”. There is a bit more to it than just sticking your finger in the middle of the frame. :)