Now that it's been a few months since this summer's Berlin hackathon, I've closed up the survey and looked at whether we met the goals we'd set. The answer: mostly. You can read our summary, TODO, and survey results:
https://www.mediawiki.org/wiki/Berlin_Hackathon_2012/Retrospective
You can also view the videos of almost all of the tutorials:
https://commons.wikimedia.org/wiki/Category:Hackathon_Berlin_2012
The video that hasn't made it onto Commons yet is the video of Roan & Timo's Gadgets tutorial, but it is on Vimeo in the WMDE "Berlin Hackathon 2012" album:
http://vimeo.com/album/2013929
and we're trying to get it onto Commons.
Thanks again to WMDE, Nicole Ebber, Maria Roessler, Daniel Kinzler, Rachel Farrand, Lydia Pintscher, and everyone who made this event possible.