A nice move by Microsoft, actually a great move. Of course there is still a way around it and I would guess that if your company is still running something less than IE 8 they will use this method to block it, noted by Ryan Gavin:
>The Internet Explorer 8 and Internet Explorer 9 Automatic Update Blocker toolkits prevent automatic upgrades of IE for Windows customers who do not want them. Of course, we firmly believe that IE9 is the most compelling browser for business customers, and we want them to make the decision to upgrade at their convenience.