Hi, 
  
10.8 ist running on my Opti 755. Shutdown, Reboot and Sleep ist working, but ethernet is broken when machine wakes up... also i have not sound, Kernel Panics on Voodoo HDA 2.7.3, no sound on 2.7.2... 
  
I'm using a nVidia GT220 running natively with device-propertys string in chameleon boot.plist 
  
Working tomorrow on it... like to drink a beer now! 
  
Cheers, 
Peter