A call to arms!

Our site's Help section has a What topics can I ask about here? which currently provides only general guidance about what works well on Stack Exchange sites. I want to expand that section of our help to have specific examples of topics.

Please post answers containing topics you feel are, well, on-topic. ...invent them, cull them from the main site, dredge them up from the Area51 proposal; whatever.

Everyone is encouraged to up/down vote on as many of the topics as they wish. When we have what seems like some consensus, we'll harvest the cream into the Help section.

Let's try to keep the list relatively short; We're hunting for the main topics we want to see.