A Yellow-faced Whipsnake (Demansia psammophis), a day hunting, lightning-fast snake that chases lizards.
They grow to about a metre and are not considered dangerous to humans, but they can bite at lightning speed. I had a close experience with one near Perth that slid out the funnel trap opening while I was trying to see inside. Suddenly I had an annoyed whipsnake head only an inch from my eye, luckily he was only having a look at me too!
The subspecies in the northwest is cupreiceps with a nice copper head and tail.
The wonderful Black-headed Python (Aspidites melanocephalus) we found while driving along the railway road late one afternoon. The videos of this snake are at http://wazoologist.blogspot.com/2010/06/black-headed-python-videos.html
My boss Trin over the moon holding the Black-headed Python.