I got my instructors rating last June and I'm in a similar boat to you in that I am tied to the Melbourne region.
So far, I've yet to have a sniff of a job - I regularly suit up and visit the local schools in person and speak with the head honchos. They either don't need instructors or only want the Grade 1 multi IFR guys. Just look at the AFAP jobs page recently. Of the four on my course only one is employed as an instructor - he worked for the school before the course in another capacity and is only doing 1-2 hours per week.
From what people tell me there has been a substantial drop off in the amount of instructing work over the past year or so and schools in the Melbourne region are struggling. I'm not sure if this is true everywhere, but I guess this is likely tied to the nationwide economic slow down and the overall uncertainty.