Those who know me also know that because of both my research career and my free software involvement I attended a lot of conferences and talks. And I really mean a lot. Still, I had to wait for the very first keynote of the Gran Canaria Desktop Summit to attend the finest, and brightest talk I ever attended. It was very rich, didn't simply stick to the technical side of things but got deep into various fields, most notably philosophy. Of course the speaker deserves credit. So if you see this man giving a talk near you:
Simply run and attend his talk. He's also a very nice person, and since he uses free software, he probably matches perfectly his own quote from his keynote (which is getting famous):
Liberal software is software which a gentleman would use.