This Sunday at FOSDEM I will have a lightning session at FOSDEM:
How to hack on Wikipedia
It is in fact an intro to MediaWiki & Wikimedia tech contributions,
designed to be reusable and customized by others for other occasions.
I just uploaded a new version at
https://commons.wikimedia.org/wiki/File:How_to_hack_on_Wikipedia.pdf
Still working on details & credits. Your feedback is welcome!
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Quim Gil
Technical Contributor Coordinator @ Wikimedia Foundation
http://www.mediawiki.org/wiki/User:Qgil