As a Internet professional and a big Google fan I was quite upset to find out that google has been playing big brother by recording my web history. HERE IS HOW YOU CAN STOP THAT.
FIRST: Google can only record your web activity if you have any sort of google account. So, if you have Gmail or Picassa, Google Analytics, Google Adwords, Google Webmaster or any other account that you log on on Google then your web activity is being monitored and recorded.
HOW TO STOP IT: Visit the link below, log on to Web History and if you see a list of your web activity that means that google is recording. Find the link that says "Delete Web History". Click on that and automatically Google Web History will be paused.
ALSO CHECK PC WORLD: Issues that arise from the introduction of Personilized Search by Google Web History. NOT ONLY A PRIVACY ISSUE: http://www.pcworld.com/businesscenter/article/183891/google_personalized_results_could_be_bad_for_search.html