I don't know which URLs are broken, but I don't have a hard time finding docs from Apple. I rarely view docs based on a URL another dev passes along. We usually trade advice like "check out the UIViewController doc" or "read the Threading Programming Guide" instead. In an ideal world the URLs would be consistent and concrete, but they're really secondary in this particular culture. I think you're making a mountain out of a mole hill to be paranoid about it.