Here are some links to the Cardiff Martial Arts Conference Keynotes.
Watching video lectures is hard for me personally, but they are all excellent! If I had to pick a favorate it is the one by D. S. Farrer on the changes in anthropology. Farrer has almost single handedly invented the field of Martial Arts Anthropology. All of the lectures attempt to make bridges between different focuses of inquiry, showing broad possibilities for new ways of thinking about martial arts.