Windows SharePoint Services 3.0 is now available for Windows Server 2003 in x86 and x64 versions.
Links:

Windows SharePoint Services 3.0 Download (77.7 MB)
Installing WSS 3.0 on SBS 2003 (.doc) *
System Requirements
Compare WSS 3.0 to WSS 2.0 (.doc)
Upgrading WSS 2.0 to WSS 3.0 (Visio)
Preview New Application Templates for WSS 3.0 
Downloads for WSS

*Note, per the WSS 3.0 & SBS whitepaper above:
“Some of the […]

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