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I have subscribed to Digital Photography School newsletters for over three years now, and I believe it deserves some praise.
It is a treasure trove of useful information for photographers from beginners to professionals, and I have learned an incredible amount about photography from them.
Always interesting - great articles, tutorials, tips, photo theme collections, reviews of photography equipment, a forum, Q&A, Photoshop and Lightroom lessons, weekly photo challenge... the list goes on. Darren Rowse, a fellow Aussie, is the principal, but he has a wide circle of professionals as contributors.