Update: Installing Windows Server Update Services 3.0 on Windows Small Business Server 2003

A new updated version of white paper.

Installing Windows Server Update Services 3.0 on Windows Small Business Server 2003

Also Look at;

Software updates are not managed by Windows Small Business Server 2003 Update
Services after you upgrade to Windows Server Update Services 3.0 Service Pack 1

..before you apply SP1 for WSUS 3.0.