Like the prev poster said, the volume key works fine.
The brightness key is handled by the dsdt (so it doesn't show the popup on os x), but it works fine
The display button has been disabled in the dsdt due to a bug that causes the screen to corrupt.
The print screen button maps to cmd + shift + 3
The battery and wireless button send keycodes that are not handled by anything, however you should be able to make program to intercept them. I will be making the kext remap them or launch applications when they are pressed.
The sleep button make the computer go to sleep...
So ,out of all of them, the only ones that don't work are the wireless, battery, and display buttons.