I particularly enjoyed the Google Webmaster Central blog entry Tips for getting help with your site.
It covers how to ask questions in a public forum rather well, and I think almost all the rules apply to our Q&A engine:
- Ask in public.
- Do your homework.
- Be specific.
- Make it relevant to others.
- Let us know if you’ve found a bug.
- Stay on-topic.
- Stay calm.
- Listen, even when it’s not what you wanted to hear.
I think the only one that isn't relevant (except on meta) is #5 and possibly #7.
As for all the others, I believe we've discussed them in some detail here on meta, and I was wondering if we could somehow incorporate this advice, maybe in the "how to ask" sidebar?