Lawless, I have the very same MB model as you do! I can't boot OS X Install with the regular Zephyroth 10.5.2 disk ("Still waiting for root device"-error), but when I manually edited the install disk with the SB600 kexts, the dvd managed to boot all the way into the installer! Only problem now is, that I can't see my Samsung SATA-II disk at all, even with the SB600 kexts.. All I see in Disk Utility is my two cd/dvd-drives. Also, when I try to mount my HDD manually in the Installer Command Prompt it says that I can't do that because it doesn't recognise the filesystem. :S Is there any specific command I need to execute for the install to see my HDD? Do you have any solution to the problem?

See my config below:

CPU: AMD Athlon 64 x2 4800+ @ 2.5GHz
MB: MSI K9A2 CF-F
RAM: 4Gb Corsair (DDR2 667) @ 800MHz
North Bridge: ATi/AMD 780
South Bridge: ATi SB600
DVD Drive: LiteOn DVDRW SHM-165P6S (IDE)
HDD: Samsung Spinpoint T166 320GB (SATA-II)