Internet Explorer 9 has tremendous improvements over its predecessor. However with all the modern browser pushing to respect user privacy. IE 9 had the pressure to do that. Now with IE 9 you can enable do not track feature which will enable privacy and protection. Following is the what do not track means:
Click on the Tools (Gear) button or press Alt-X in IE9.
Go to Safety in the pull down menu.
Click on Your Personalized List.
Click on Enable button in the lower-right corner of the “Manage Add-ons” dialog box to turn on Do Not Track feature.
Once enabled, IE9 will start automatically generate a list of blocked third-party operators in the Personalized Tracking Protection List based on third-party contents hosted on the sites you visit. IE9 monitors if a third party is delivering content to more than a few websites, which indicates it may tracking the web users.