All of us have experienced this, you go to google something, and then no search results are returned. Or maybe you need to know something REALLY important, but you can only find very vague information about the topic.
Its frustrating, isn't it? I know I go crazy when I can't find exactly what I am looking for. So why not make a site off of that? I know its common sense, but if you can't find it on the internet, find it in a book. It seems like books are a lost cause, but they are also a highly valuable resource for writing on subjects or making an entire website out of it.
Remember, the purpose of creating a site is to bring valuable information to your readers. That is if you actually CARE about your readers and what they want. If not, disregard this post entirely.
So the next time you use google to find something and nothing relevant shows up: make a website.