It's not data, but there are notes from the "future of Wikimania" open discussion that we had posted here:
http://wikimania2009.wikimedia.org/wiki/Wikimania_planning_discussion/notes

sorry I didn't send this out sooner.
-- phoebe



On Fri, Dec 4, 2009 at 2:20 PM, James Owen <jowen@wikimedia.org> wrote:
Does anyone have the Wikimania 2009 Postmortem study, or any data which was collected after the conference?