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!