As the site matures, it seems like it might be a good idea to have some boilerplate comments that are likely to be needed on a fairly regular basis and that can be posted by site regulars as necessary. Examples of uses for such comments might be
- welcoming new users to the site to make them feel like they are joining a community
- notifying people of policies that the community agrees on, such as the policy on homework questions, on reference-only answers, etc.
- directing people to community wiki posts on the meta site that contain more information.
On the last point, it might also be a good idea to put up some community wikis on meta that serve as information pages with more detail on policies, FAQs etc. What I have in mind is something like this example from TeX SE.
If you have any thoughts on what might be useful comments, please post them below. Perhaps we could stick to one comment per answer so that we can vote on individual ideas.