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/> , where I've
started various articles on operational issues (as time permits).
Participation is more than welcome!