Over at Mathoverflow, we put a lot of time and thought into the FAQ. While a lot of it is not applicable to math.SE, there are a number of ideas there that could be very useful to this site.
I suggest that you take a look and discuss what might be useful and what might not be.
We also crafted a page about how to ask questions, which encourages good question-asking practices (do your homework, be precise, break it down, provide background or motivation, good formatting, choosing a good title, etc.). A lot of work was put into this as well (mainly by Anton), and we at meta.MO are pretty proud of how it came out.
I ask that you actually read the documents before posting. Knee-jerk responses do nothing but lower the signal-to-noise ratio.