Followed the instructions to the letter and when attempting to boot to the USB stick, I get a black screen with blinking cursor. Nothing happens. Tried two different USB sticks, two different OS X discs (both 10.6.0 retail), and even a different D430.
What I did was basically this:
1. format & partition USB stick, GUID partition (also tried MBR just to be certain)
2. restore SL DVD onto USB stick
3. install Chameleon onto USB stick
4. extract Extra.zip onto root of USB stick
The D430 has the A09 BIOS, if that matters.