There was a post or blog by Quim Gil (or was it it in the interview?) about this. They are working on this but they won't open source everything just because they can since it costs additional money to release the sources. Also it helps a lot when there is good (business) reason for having the source open. One example was the Hildon input framework which was closed but was opened recently because there were good reasons, see http://maemo.org/news/announcements/...189194936.html