Just got word from Zardon @ Driver Heaven.net that Omegadrive has released a new set of Omega Drivers 2.4.62 based on the official ATI 02.3 Catalyst drivers for Windows 9x/ME. What's New:

Based on the official 2.3 Catalyst drivers.
Improved OpenGL performance.
New Control Panel is integrated, it has the new TrueForm Option.
Re-enabled the "application choosen" Z-Buffer depht since some OpenGL games displayed graphic anomalies when it was forced.

The WDM files have been removed from the driver package to reduce download size and time, if you need them there is a separate link in my ATI page with a link to the latest WDM drivers.

Added support for the following cards:

TYAN TACHYON G9000 PRO
FIC AT009 RADEON 9000 PRO
SAPPHIRE RADEON 9000 ATLANTIS PRO
HIGHTECH EXCALIBUR RADEON 9000 PRO

Download Omega Drivers 2.4.62 for Windows 9x/ME