Here are download links for the latest versions of the tools mentioned.

NETUSERS
http://www.optimumx.com/
http://www.optimumx.com/download/

The latest NETDOM 5.2.3790.1830 tool can be found here
Windows Server 2003 Service Pack 1 32-bit Support Tools

Download Link:
http://www.microsoft.com/downloads/detai...;displaylang=en
File Name: WindowsServer2003-KB892777-SupportTools-x86-ENU.exe
Version: SP1
Date Published: 3/30/2005
Language: English
Download Size: 5336 KB

KB Article:
Windows Server 2003 Service Pack 1 Support Tools
http://support.microsoft.com/kb/892777

MORE INFORMATION
Windows Server 2003 SP1 includes updates for the following Support Tools:
• Acldiag.exe
• Adsiedit.msc
• Bitsadmin.exe
• Dcdiag.exe
• Dfsutil.exe
• Dnslint.exe
• Dsacls.exe
• Iadstools.dll
• Ktpass.exe
• Ldp.exe
• Netdiag.exe
• Netdom.exe Version 5.2.3790.1830
• Ntfrsutl.exe
• Portqry.exe
• Repadmin.exe
• Replmon.exe
• Setspn.exe