Below are a couple of links that we frequent. They are all great sites where you can definitely learn more than a thing or two.
Nature Photographic Society, Singapore - NPS(S) - In my opinion, this is the best nature photographysite in this part of the world. I owe all my progress to the people here who have guided me over the years.
Dr. Graeme Guy - Founder of NPS(S) - Superb nature photography from various continents.
SC Fang - Vice-President of NPS(S) - Very experienced bird photographer.
PT Lee - Webmaster and EXCO member of NPS(S) - Birder, panoramic image maker and our IT savvy guy.