I thought this slideshare on complexity and lean thinking and kanban was fascinating. I learnt a lot. Jurgen Appelo does a good job pointing to the downsides of various manufacturing models when working in complex systems. (And any system involving working with humans is likely to be complex.)
I especially liked the link to Rob Cross on the Hidden Power of Social Networks, with the maxim that connectivity has more effect than knowledge. I will probably try to use that next time I'm trying to persuade conference organisers to cut down on the expert presentations and increase the informal conversations.
Hat tip: John Tropea's comment on Chris Rodgers blog