Until recently I had not given this a lot of thought but than I got talking to Serge Ravet about running a knowledge cafe at the MISC 2010 conference to be held in London in late January and he introduced me to the topic.
So I googled around a bit and found this amazing keynote presentation at OSCON 2005 from Dick Hardt on Identity 2.0. Recorded a few years ago now but still relevant today. Well worth a watch - if only for his presentation style!
