You can find the download here:
The TechCenter is here:
From the TechCenter:
New in System Center Updates Publisher 2011
- An improved user interface that allows better control of managing software updates.
- A new automatic publication type with which Updates Publisher 2011 can query Configuration Manager to determine whether the selected software update or software update bundle is published with full content or only metadata.
- A new Software Update Cleanup Wizard that you can use to expire software updates that exist on the update server, but are not in the Updates Publisher 2011 repository.
- The ability to create Software Update bundles
- The ability to define prerequisite updates and superseded updates as part of a software update definition