Lygaeidae, Spilostethus hospes, I would say.
The link looks not very trustable: It is not a Stink Bug and it is not a Coreidae, but it is yours ;-)...
A selfie:
http://www.flickr.com/photos/23985194@N06/8395813182
http://www.saveourwaterwaysnow.com.au/01_cms/details_pop.asp?ID=1160
http://www.flickr.com/photos/dioleung/2930801989/
http://www.brisbaneinsects.com/brisbane_lygaeoidbugs/MilkweedBug.htm
http://www.brisbaneinsects.com/brisbane_bugs/MilkweedBug.htm?NSID=XnIR_u
Very similar one, but not exactly the same:
http://www.projectnoah.org/spottings/128016004
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