I read this paper for my Applications paper in our networking class, and I was struck by the difference in approach that applications research could take compared with what our last area, architecture, could do. They were able to create an add-on for a popular BitTorrent client that would allow them to use real peers for their research, giving them a large test base practically overnight and giving the peers the benefits of the research instantly. What a great situation to do research in! If only there were some way for architecture to be able to get "buy-in" from network users so easily...