OK, here's the deal:
Got my IDE to SATA connector today (FINALLY!!).
Plugged my dvd burned into ther, plugged it into my main SATA controller (not that damn jmicron one).
Well, DARWIN BOOTS!
Sooooo gooood. Using my 10.4.6 dvd currently, looks like it hung with a grey apple... gonna do verbose mode next here in a minute.
Lets see, I think that's it... I'll post what verbose does for me.. unless thats for darwin part only... hmm, we'll see

Oh yea, if I can't get it to boot properly, I'll try the vmware way.. I've got a fresh new 80gb sataII drive for the job as well

EDIT:
Ok, found my problem, probably will work for you:
Verbose mode gives ugly results.. exactally what the installed os 10.4.6 drive said from my other box when I poped it in this one...
FireWire (OHCI) TI ID 8023 PCI: Bad selfID's, issuing bus reset (retry -has a number that goes to 40)
/SourceCache/AppleFWOHCI/AppleFWOCHI-259.4.0/AppleFWOHCI.cpp 2760: ERROR: Firewire (OHCI) TI ID 8023 PCI: handle UnrecoverableErrorInt
Then, after 40'th time:
Still waiting for root device 3 times..
FireWire (OHCI) TI ID 8023 PCI: 136 bus resets in last minute.
Still waiting for....... several more times; I'm gonna fiddle with bios now, the ahci and ata thingie.. maybe pop in another sata port.
ooo, new thingie:
FireWire (OHCI) TI ID 8023 PCI: 96 bus resets in last minute.
Still waiting for root device
guess it does in 3x intervals? I wonder what happens when it hits 0....
EDIT: hmm, stalls and does 3x od waiting, doesnt go less than 96

Thought I might also pop in:
Since this is a cpp file and erroring on what looks like line 2706 (That right?) couldn't it be edited and fixed? or bypassed?
EDIT:
Yay, more info :\
Well, with AHCI for the controller the dvd rom is plugged into, comes up in verbose and hangs quite quickly:
Waiting for boot volume with UUID [bunch of numbers, too lazy to copy]
Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourcesMatch</key><string ID="2">boot-uuid-media</string></dict>
heh, guess I'll try the 10.4.7 cd next, then vmware-ing it.

Hope this helps, hope somebody has answers to my above questions

Final Edit for the night:
Well, I tried all 3 of my SATA controllers (SiI, Jmicron, and the one the bios refers to as IDE (or raid/ahci)... couldn't get it to boot the installer with any combinations

I had to unplug my ps/2 KB, plugin a usb one (poped in my mac kb).. then it came up with
USB device thingie (i dont remember it 1:1) signaled wake (ahci [or something])
Still waiting for root device
Still waiting for root device
Still waiting for root device
Still waiting for root device
ect.......
so, i dunno what else to do other than VMWare... I'll work on this come sunday, work tomarrow, booo.