Google offer users an option to opt-out of their Google Analytics system. That basically means that if you visit a website that uses Google Analytics for tracking, your visit won’t be recorded by Google.
Over the past year, we have been exploring ways to offer users more choice on how their data is collected by Google Analytics. We concluded that the best approach would be to develop a global browser based plug-in to allow users to opt out of being tracked by Google Analytics.
Also see: How to Opt-out of Interest Advertising
The Google Analytics opt-out tool needs to be installed on all browsers but if you want to prevent Google Analytics from tracking your visit system-wide, open your Windows hosts file and add the following line:
# [Google Analytics] 127.0.0.1 www.google-analytics.com