Pointer to presentations on academic P2P traffic management?

I was there. It was at NANOG that I saw good presentations on how academic operators handle P2P overloads in a fair way. Unfortunately, my wetware is not coming up with the when or the where of the there. Could anyone point me to the presentation(s)? Unicast is fine. Incidentally, this particular material is going into an article on P2P at http://www.citizendium.org <http://www.citizendium.org/> , where I've started various articles on operational issues (as time permits). Participation is more than welcome! Howard