This page is a place holder for examples of how people currently collect questions and answers
DocBook has a <qandaset> element http://www.docbook.org/tdg/en/html/qandaset.html which is used with <question> and <answer> elements, and optionally <qandadiv> elements.
The Firefox faq is marked up with <dl> http://www.mozilla.org/support/firefox/faq as is the old Mozilla 1.5 FAQ: http://www.mozilla.org/start/1.5/faq/profile.html#newprofile Both of them are separated into sections and have tables of contents.
For the W3C XHTML faq, the table of contents is in an ordered list, and contains urls that point to the question/answer fragments below. The question answer fragments are an h3 element paired with one or more p elements.