I've managed to get my install working perfectly now in 64 bit mode, vanilla kernel. My specs currently:

Gigabyte GA-G31M-ES2L Rev 2.0
Core 2 Duo E4500 (2.2GHz)
2 GB DDR667 RAM
nVidia GeForce 9500 GT (eVGA)
Netgear GA311 GBit NIC
250GB Seagate SATA
LG SuperMulti 22x SATA DVD+/-RW
Dell 2007WFP LCD


Onboard NIC doesn't work, hence the GA311 PCI card. Haven't really tested the onboard video as I have a 9500GT. Have full QE/CI/OpenGL/OpenCL support with the 9500GT. Audio, sleep, restart, shutdown all work perfectly as well. I did have to augment sleep with the PleaseSleep application to get it to sleep automatically.

Software used:
- Chameleon 2.0 RC3
- PCI EFI 10.3
- PleaseSleep

KEXTs used:
- fakesmc (v2)
- NullCPUPowerManagement
- SleepEnabler
- HDA
- OpenHaltRestart

DSDT patches needed:
- RTC Fix
- USB EHCI/UHCI Sleep Fix
- HDEF audio fix

When I get a chance, I'll package up my DSDT and kext's for anyone who wants them.