yep no taxes in aus, unless you actually list your occupation as professional gambler (or something like that anyway).
In general all gambling winnings in australia are not taxed.
Checklist for becoming an aussie
[x] love cricket
[x] love football (NRL/AFL)
[x] say mate at least 20 times an hour
[x] love beer
[x] love gamboooling
i passed, did you?
Also going to this website might help. - http://www.citizenship.gov.au/