I'm working on the OpenGL wiki page, and it would have been really handy if markdown supported intra-links. Wiki pages and FAQ pages can become really long, so adding a "back to top" link would be really helpful for navigation.
<h1 id="faq">FAQ</h1> .. A lot of questions and answers .. <a href="#faq">Back to the top</a>
If this is a case of PEBKAC however, please tell me how this can be done in markup, or the HTML subset it supports.
EDIT: "Back to top" is obviously just an example. It would be handy to refer back to sub-sections, as Roger Pate explained.