Download: http://www.microsoft.com/windowsserversystem/updateservices/downloads/WSUS.mspx
Server Diagnostic Tool: http://download.microsoft.com/download/7/7/4/7745a34e-f563-443b-b4f8-3a289e995255/WSUS%20Server%20Debug%20Tool.EXE
Main Page:http://www.microsoft.com/windowsserversystem/updateservices/default.mspx
Overview of WSUShttp://www.microsoft.com/downloads/info.aspx?na=22&p=2&SrcDisplayLang=en&SrcCategoryId=&SrcFamilyId=&genscs=&u=%2fdownloads%2fdetails.aspx%3fFamilyID%3d2478d594-a29c-483c-9dc1-9740bf3081a5%26DisplayLang%3den
Step by Step for Windows 2003http://www.microsoft.com/downloads/details.aspx?FamilyID=3ba03939-a5a9-407b-a4b0-1290ba5182f8&DisplayLang=en
Step by Step for Windows 2000http://www.microsoft.com/downloads/info.aspx?na=22&p=1&SrcDisplayLang=en&SrcCategoryId=&SrcFamilyId=&genscs=&u=%2fdownloads%2fdetails.aspx%3fFamilyID%3d4169c932-63b5-4629-91d3-c8901c2afa07%26DisplayLang%3den
WSUS Ops Guidehttp://www.microsoft.com/downloads/info.aspx?na=22&p=3&SrcDisplayLang=en&SrcCategoryId=&SrcFamilyId=&genscs=&u=%2fdownloads%2fdetails.aspx%3fFamilyID%3de26bcdb4-ef0b-4399-8a71-9b3b00c4f4cd%26DisplayLang%3den
WSUS Deployment Guidehttp://www.microsoft.com/downloads/info.aspx?na=22&p=4&SrcDisplayLang=en&SrcCategoryId=&SrcFamilyId=&genscs=&u=%2fdownloads%2fdetails.aspx%3fFamilyID%3de99c9d13-63e0-41ce-a646-eb36f1d3e987%26DisplayLang%3den
WSUS Step by Step Migration from SUShttp://www.microsoft.com/downloads/info.aspx?na=22&p=5&SrcDisplayLang=en&SrcCategoryId=&SrcFamilyId=&genscs=&u=%2fdownloads%2fdetails.aspx%3fFamilyID%3d150e795e-ae32-4d47-a6b8-e01f918aae93%26DisplayLang%3den