Dear all, 
I've uploaded my Wikimania slides, and I created the category on Commons "Wikisource presentation slides": http://commons.wikimedia.org/wiki/Category:Wikisource_presentation_slides
Please use it in the future, and possible on your past uploaded slides, it would be nice to have them all in the same category. 
We have a lot work to do together, let's start sharing our documentation :-)

Aubrey