Ok, this is how far I've got.

I have an Olidata Stainer 3000 Notebook with:
CPU: AMD Turion(tm) 64 X2 Mobile Technology TL-50
RAM: 2GB
Graphics: Radeon Xpress 1100
Chipset: ATI South Bridge 400
HDD: WDC WD1200BEVS-0 (SATA)

Installed using MBR-Partition Scheme and MBR-Fix + 9.20 Kernel (shows just 1 kernel in system profiler...). Got gray screen of death at first boot. Then on second boot using "-v" parm and it didn't crash. Got native resolution (1280x800) working using Callisto driver beta 3 (but no QE/CI, of course). My HAMA Wireless USB works using RT73 drivers.

In the logs there are many "_CFGetHostUUIDString: unable to determine UUID for host. Error: 35" messages and the boot progess is quite long, because at the end of loading all drivers it just seems to sleep and then it shows "IOKitWaitQuiet() timed out" warning.

And although sound was working with Kalyway 10.4.10 AMD, it doesn't work with this Leopard release. Still trying to locate the right kernel extension for that IntelHDA driver.

lshw output on linux for that soundcard show's this:
*-multimedia
description: Audio device
product: SB450 HDA Audio
vendor: ATI Technologies Inc
physical id: 14.2
bus info: pci@0000:00:14.2
version: 01
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=HDA Intel latency=64 module=snd_hda_intel

Anyway thanks zephyroth for the great work. Including those VIAATA/ATI SB kexts on the DVD made it easy to install this on my AMD/ATI-Notebook.