Editor: fuzzylime (faq) is the easiEST way for you to help your users.
A user posts a question, you answer it once - and everyone can then see that response.
Add to that the incredible ease of set-up and use, and interesting way it updates in your page. The script in actionfuzzylime (faq) was written in response to a real-life situation where a load of users were in the some position of not knowing much about a new system.
It allows them to communicate directly and help each other out - with an archive kept of their responses so they're of more use to people in future. As well as using JavaScript and Ajax heavily to make the pages update automatically, the script shows which Questions and Answers are the most popular and can restrict exactly who is allowed to view, ask, answer and edit questions. It has tags, making things even easier to search. It also got a full search engine built in so your users can hunt down exactly the right response.