Nielsen's Law of Internet Bandwidth (Alertbox 1998; updated 2010 - still a good fit)
Royal Pingdom » Internet 2010 in numbers. Posted in Tech blog on January 12th, 2011 by Pingdom What happened with the Internet in 2010?
How many websites were added? How many emails were sent? How many Internet users were there? Royal Pingdom. Internet World Stats - Usage and Population Statistics.