Google Analytics is a website tracking software which can track your IP address, browser information, operating system, country and more when you visit a website. This information is usually available with both Google and also with the website you visit.
Most of the analytics software do not provide end-users with a way to opt-out. However, Google does provide users with an option to disable Google Analytics using browser based add-ons for Firefox, IE and Google Chrome. We had written about the Google Analytics Blocker in the past and you can download the add-on for your own browser by visiting this URL.
Once you install this add-on Google Analytics will no longer track your visits to websites which make use of their service. We will keep an eye for other services which disable analytics for other services and let you know once we come across something.