This is what mediawiki should have done from the start...
["A Distributed Publishing Framework... (screencast)" via Quickie screencast - a distributed publishing framework...]
In many respects, this makes the wiki page self-disaggregating and embeddable at a section level, which is a Good Thing :-)
Something else came tomy notice on the disaggregation from last week - PCF Converter. Although it requires a subscription to be really useful, this service will take an online or uploaded pdf, and do this to it:
PS I'm still wating to see what becomes of oEmbed... I managed to find a Django library that handles oEmbed, along with a PHP/Zend oEmbed component proposal, but haven't found any other helper libraries so far... Does Drupal have an oEmbed handler plug-in yet, I wonder? ;-)