The U.S. National Infrastructure Protection Center (NIPC) has updated their advisory concerning the RPC vulnerability in Microsoft operating systems. They note that there has been increased scanning for the vulnerability on the Internet recently, so they recommend patching affected systems or blocking TCP and UDP ports 135, 139 and 445 at the perimeter.
Savvy System Administrators will have done one, or probably both, of these already, so this is a reminder to the technical staff: don't just remind users about Safe Hex; practice it yourself.