I think titles should provide anchors, to give easily pointer, or just to easily navigates, like at http://gna.org/about

It would be a pain to handle that by hand each time. I think a simple html_part($level, $title); should do the job, where level is between 1 to 5 (that will be translated in h1, h2... h5) and the title the content (that will be simplified to be an anchor). To avoid i18n issue, maybe a third argument should exist.
part Numbering would be great to easy (and trivial to do), but we cannot count on it for the anchors, since users can have more or less parts depending on their rights.