[j_s]

I was not aware that the new analytics would track users. One interpretation of section 7 of the Google Analytics Terms of Service is that tracking individuals is not allowed:

http://www.google.com/analytics/terms/us.html

  > You will not [...] use  the Service to track, collect or 
  > upload any data that personally identifies an individual 

http://productforums.google.com/forum/#!topic/analytics/tTaq...

  > you cannot store names or ip addresses in a custom var, 
  > but you can store ids that need your backend to resolve 
  > into a person identification

[Brandon0]

Tracking an individual is different than storing personally identifiable information. I can assign you an arbitrary (or seemingly arbitrary) userID (that is unique to you), but does not personally identify you, as a way to track you. This arbitrary userID is meaningless to any third parties. What I cannot assign you, is your name, email address, or even IP address as a way to track you since anyone that sees that information could figure out who it belongs to.