System Center Updates Publisher is an add-on application designed to extend the software update management functionality in System Center Essentials 2007. It provides SCE administrators the ability to import, create, and publish custom software update information to their SCE server. By using the Updates Publisher to define a custom software update and publish it to the server, a SCE administrator can begin detecting and deploying that update to the client and server computers in their organization. The System Center Updates Publisher enables SCE administrators to do the following:
Source: MS Connect webpage
You can download it from the MS Connect website, here.