WSS and SPS2003 Service Pack 1
MicrosoftSharePointTechnology
The SPS2003 and WSS service packs are now available from the Microsoft web site.
Windows SharePoint Services SP1 [download] [fixlist] SharePoint Portal Server 2003 SP1 [download] [fixlist]
The Administrators Guide has also been updated. The updated SharePoint administrators guide can be downloaded from here.
http://www.microsoft.com/resources/documentation/wss/2/all/adminguide/en-us/default.mspx