I could upload the following:
Nvidia Omega Drivers 1.4523 04.06.2003 Windows 98,ME (based on Forceware 45.23 which is also often the recommended Forceware at least for Windows 98/ME and it's the last Omega release for Windows 98/ME)
Radeon Omega Drivers 2.6.37 based on Catalyst 4.2 (Windows 98/ME) [last release for Windows 98,ME]
Radeon Omega Drivers 3.8.252 (Catalyst 6.5) Windows 2000/XP [last version to support Radeon 7k,8k,9k-9250 Series]
Radeon Omega Drivers 4.8.442 (Catalyst 7.12) Windows 2000/XP/2003 [this appears to be the final ATI Omega driver]
I also have Omega Readme, FAQ and BIOS settings in odt files I created in 2007 by copy & pasting from the Omega drivers website.
So let me know if you need anything of that stuff.