Start a forum on a topic you don't know or understand a whole lot. Like say you started a scripting site and you knew HTML and a little php but nothing else (if you're wondering this is NOT going to be the topic - I just don't want to give away my idea...).
The web idea is a passion of mine. So I like the idea but like any other topic is filled with a lot of information and some of which I couldn't offer my users. I understand no one can know everything about one topic. Where I have a problem is the fear of the idea "Well this guy has NO IDEA what he is talking about. Why should I come here?!".
The reason I want to make the site is to help people like me who don't know a lot about the topic connect with those who do. Granted I can regurgitate information that other people have established. But if I don't understand the principles of the idea why would I expect them to understand me when I repost them?
Would you do it? Or did you do it? How successful have you been?