There's a new book out from O'Reilly:
"MediaWiki - Wikipedia and Beyond" by Daniel J. Barrett (http://oreilly.com/catalog/9780596519797/)
I find it a very concise and useful manual from using and administering MediaWiki to creating your own extensions.
I discovered a MediaWiki page in Moodle Docs which could benefit from some more content or linking to related pages
Moodle community sites
Moodle documentation: "MediaWiki - Wikipedia and Beyond"
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