Another thought, this forum is rather large and active. Due to just its popularity and activity, I would have to say its going to be rather difficult to come up with a thread that has not already been created at some point. Things will get repeated, but I have to say that I do my best to search through this forum and using google, and every time there are multiple threads to the question I am answering and I tend to click on more than one to see what the responses are for the same questions. Sometimes there are conflicting answers, especially on those types of threads of is technique x better than y or is item a better than b. Its not always a bad thing to see a number of threads out there with the same topic to get an idea of what others are thinking/doing.
If anything, the small but loud enough users on this forum who feel they have to let someone know that their thread has already been posted and they should learn how to search makes it so more reserved members don't even bother asking questions when they need help. I know I hesitate and research this forum as much as I can before I post a question, not because I am worried nobody will help me, its almost a guarantee someone will help out, but because I don't want to be yelled at by someone on their high horse telling me I didn't do a good job searching the forums.