There are many, many tutorials on the web. However, very few of them are actively maintained and updated based on input from those who read them. In other words, most online instructional content is no better (and usually worse) than a well-written book; the advantages of being updateable in real time and having almost instantaneous communication with "students" are lost. All of my tutorials contain links to my contact information and I have plans to tightly integrate communication all tutorials on this website.
After interaction comes adaptation: different people need different material for learning any given subject. Ideally, tutorials contain enough information for most people, and let each individual quickly and easily isolate the material relevant to him/her. See the first tutorial link for my solution to this problem.
Let me know if you're interested!