SPW Projects
Here you can list what you are thinking about contributing to the wiki/already working on. Feel free to link to your User page, if you would like to collaborate with others, so whoever is interested can contact you.
MediaWiki Introduction
As I am starting to use MediaWiki I am documenting useful bits that I learn. At some point I would like to pour all of this, as well as other good introductory resources into one page that can be an introduction for people who want to start contributing to the wiki but have never worked with MediaWiki.
I am currently collecting my learning on my talk page. Feel free to contribute something there or get in touch if you would like to collaborate on creating a MediaWiki 101.