tedster - 2:54 am on Feb 15, 2012 (gmt 0)
This may help clarify our discussion - Google does take two different kinds of actions. One they call "personalization". The other they call "customization".
Check out our help center for more details on personalized search [google.com], how we customize results [google.com] and how you can turn off personalization [google.com].
...and from that last link:
If you aren't signed in to a Google Account, your search experience will be customized based on past search information linked to a cookie on your browser. To disable history-based customizations, follow these steps: