All About Microsoft posted a story that Microsoft is introducing a new feature, Tracking Protection, to Internet Explorer 9

Microsoft officials said to expect the new feature to be part of the Release Candidate (RC) test build of IE 9, which is due out in early 2011. Microsoft execs have not said when to expect the final version of IE 9 to be released, but I continue to hear April 2011 is the internal target.

  Microsoft to add privacy-tracking to IE 9 test build in 2011