Windows Server Update Services with Service Pack 1 (WSUS SP1) delivers updates for WSUS. This service pack includes support for Microsoft SQL Server 2005 and the forthcoming Microsoft Windows Vista operating system, and provides additional stability and performance improvements. After you install WSUS SP1, you may be required to restart your computer. You cannot remove WSUS SP1 after you install it.
Get the WSUS SP1 Overview Information
Check out the WSUS SP1 Readme
Download WSUS SP1
What's New in WSUS SP1
WSUS SP1 is a service pack release that improves the security, reliability, scalability, compatibility, and performance of WSUS. This service pack includes the following new features and improvements: