Hope that clears up what seems to be a rather murky area. Department of Immigration and Multicultural Affairs. The banking, finance and stockbroking industries always require temps to cover peak periods and agencies specialise in these areas. One of the classic backpacker jobs. There's lots of work available for those with good experience and references.
Hospitals regularly hire casual staff through nursing agencies, usually by the day.
There is a need for skilled mechanics in Oz. Sales An area with increasing opportunities. Telemarketing Not everyone's cup of tea, but can pay very well. Check TNT Magazine for companies as there is a high turnover in these jobs. They love backpackers.