Susan, I so happen to have the Cho et. al. paper in front of me at the moment. If you look at it, there is no clear distinction between high-end users and other users. there is not even a clear cut between ftth and dsl customers. There is just one long continuum of people using more and more bandwidth. The top 10% of FTTH users are using more than 2.5 Gigabytes per day, measured as an average per week. However there is also a significant amount of users close to that level, but not yet up to that level. The researchers conclude that there is no real gap between a heavy user and a normal user. James Enck sais that he can hear backbones creaking, I fear that it will be the first feet that will become hot with traffic, such that in the midst of winter you can still see where the DSL and Cable lines lay by just following the green patches in the snow.