Seems like Microsoft is testing out their new MSN Search technology at http://techpreview.search.msn.com/. As DigitalPoint points out, "Of course, no one can get to it because it's restricted by IP address, but still shows they are at least at the point of being able to test it."
From the screen below you can see "HTTP 403.6 - Forbidden: IP address rejected", now can someone get through this little IP problem? :)