Thanks DanM602 for the info & Bunnios & Arnaudt for link
"Thank you for all your help in testing Windows 2000 Service Pack 3. We are getting very close to our final build and would appreciate it if you could download and test our current release candidate without delay". (suggesting RTM is next/very close -Ed)
The W2K SP3 contains updates for the following areas of Windows 2000 functionality:
Security issues, including all fixes from Windows 2000 Security Rollup Package 1
Operating system reliability
Application compatibility
Windows 2000 Setup
SP3 also includes the updates contained in the previous service packs
NOTE: If you already have installed some of the fixes that are now in the SP3 a warning message box may pop up asking you to reinstall some of these fixes again. This happens because the file version number of the fix you installed was higher than the version number in the SP3 package. If the warning message box pops, you can ignore reinstalling the fixes and proceed with the SP3 (Build 3.151) install. Once Win2000 SP3 releases the final (RTM) build you *should* reinstall any fixes you are asked to reinstall in this warning message.
Update: Thanks brn2prgrm for supplying the link to the full network install & the express mirrors and now the full iso :)