Berlin
I'm not quite sure what to say about Berlin other than that I had an excellent trip and met many interesting people. I had the privilege of visiting the renowned Chaos Computer Club and hanging out with many of its regulars, as well as the Bootlab and the newthinking Linux Trend Store (Linux specialty store).
I wrote a multiple-page account of my trip in Portuguese for a Portuguese class assignment, so maybe in the near future I can pull that out and translate portions of it into English in order to post them here.