We've now mostly hashed out what kinds of questions are welcome on the site, and this is reflected in the official FAQ.
We should cull unwanted questions. We should reflect, and perhaps codify our tagging practice. We should build a community FAQ. The aim here is to make the site more welcoming for new users.
All of these are, in fine, the community's job. Moderators have access to tools that can facilitate things, for example we can merge tags and delete questions, but community moderators do not make the rules. So what else should we, the community, do? How can we moderators help?