Hamburg.
Day one at next09 ends with a humorous review of tweets on Twitter, by the team from TwitKrit, a German blog offering 'literary criticism' of Twitter posts. Those of you who are so inclined will know how to find #next09 comments on Twitter - or otherwise, pop in to the next09 community at SixGroups.
(Speaking seriously for a moment, though - a conference presentation compiled from random Twitter users' outstanding tweets raises some very interesting questions about the boundaries between public and private. Discuss.)