Butkus' Site for Digitized Camera Manuals - This can be a life-saving resource when you have a specific question about your camera, especially if it is an old model.
35mmc - This is a great blog for interesting and philosophical articles about photography.
Alex Luyckx Film Stock Reviews - This blog includes a wonderful inventory of detailed and interesting film and developer stock reviews for those who are looking to try something new.
Ken Rockwell's Page on Nikon Lens Compatibility - We get asked all the time whether a certain Nikon lens will work with a certain Nikon body, and understandably so! This is not simple stuff. Here is the page that we use when asked this question.
Ken Rockwell's Gear Reviews - This is a good place for anyone to start when thinking of investing in a new piece of equipment. Rockwell provides very detailed technical reviews of a wide variety of equipment.