This is very interesting, especially Wikipedia as open source project. I have been involved in Wikipedia for a couple of years now and have attended the two conferences Wikimania in Frankfurt 2005 and in Boston 2006.
I am right now developing a set of learning objects for teachers and teacher education students about wikis and most of it intigrate various wikimedia projects. I make it requirement for my students to write articles in Icelandic Wikipedia and learning content, webquests, Internet Scavenger hunts etc in Icelandic wikibooks and upload pictures they use in Wikipedia Commons.
My learning objects called (The wiki school bus) are at http://wiki.khi.is but right now the site is only in Icelandic. Hopefully I will have time soon to translate some of it and explain my ideas about using wikibooks-wikimedia-commons together and why I think that is important for teachers.