The paper seems aimed chiefly at people building private IP-based networks, although it does make mention of how unpredictable performance on the Internet will be, just so that people trying to use differenciated services don't scratch their heads when things don't speed up in a reliable way out on the Internet. They don't really advocate a tiered internet, just that prioritizing traffic can help reduce the need to add bandwidth. I can't think of a scenerio other than lose-lose in trying to set up a tiered internet. Vendors will clash like never before as their 'fast-lane' services traffic slows down on competitors networks; end users lose by having their current service degraded as providers try in vain to speed up certain types of traffic. All your neighbors would get silghtly faster VOIP traffic if they pay for it, and your traffic slows down. I'm not saying that selling prioritization is a bad thing in and of itself, just that it will result in very inconsistant results, even within a vendor's network. And, it seems to me that it will open up the door for tier 1 providors to lock out vendors like Skype or Vonage. And, it would effectively lock out innovation.