I would like to know what is the total capacity of the Internet in the
US and in the world. There was an article today on <a
href="http://news.com.com/2010-1026-5387885.html">CNET</a> mentionning
10 petabytes of data per week represents 15 percent of total U.S.
Internet traffic. That means the total internet raffic in the US is
about 66petabytes which seems low.

So I'm interested to know what's the total bandwidth/capacity of the
Internet in the world and in the US (unicast). Please details the
sources of your data so I can quote them.

Second part of the question is what's the capacity or total bandwidth
of the network of an ISP: for example (assuming everything was cached
on a big proxy placed inside the network of an ISP) what's the toal of
what they would be able to deliver to their end users?(unicast + we
assumie they would be able to smooth the traffic ovr 24hours -> there
would be no peak problem).