Well, we are almost at the 90 days threshold. Let's have another try to write our FAQ.
To avoid the pitfalls of the previous attempt, please post entries for FAQ as answers. We can later select and combine some of the answers to create the site's FAQ and this post can serve as a place for a larger FAQ (like math.se, SO, cstheory main, cstheory supplement).
Since this is Frequently Asked Questions, try to start your FAQ entry by a question (and don't post several entries in a single question). If you want to have extended discussion about a posted FAQ entry start a new meta-discussion (or chat) and post a comment linking to the discussion below the question.