The awesome Jeremy Orem has written a Mediawiki extension to allow the direct embedding of Open Video, and has turned this feature on on wiki.mozilla.org. Check out my demo page (you just type the normal HTML syntax into the wiki markup) and then feel free to use it to host Mozilla-relevant videos. (Note: wiki.mozilla.org has a 32MB file upload limit.)
It would be nice to see it on MDC too. But: MDC is not Mediawiki anymore…
This is pretty sweet. I’ve added videos to our last couple of weekly Mozilla meetings. See https://wiki.mozilla.org/WeeklyUpdates/2010-02-01#Video_for_today.27s_meeting for example.