Hi, May I give you some news about 2 encyclopedic wikis intended for children (as readers so as editors), whose proposal was made first on meta : http://meta.wikimedia.org/wiki/Wikikids and on this list two years ago: http://lists.wikimedia.org/pipermail/foundation-l/2005-January/015108.html
Such a wiki has been launched in french (in which I am involved) see an english explanation about it: http://fr.vikidia.org/index.php/Vikidia:About and in Dutch (see http://kennisnet.wikia.com/wikikids/wiki/Wikikids:English_explanation None of them are Wikimedia project.) Both have a quite active community and have reached 1000 articles.
I would be glad to know what you think about them and about the original idea that was for it to be an international Wikimedia project.
Mathias Damour