Not exactly sure what you mean by "our version of budweiser" but I'll try to answer anyway.
My fellow aussies on BYOAC may correct me as I'm more of a scotch drinker, here goes.
VB - Victoria Bitter - widely popular, cheap, guaranteed to find cases upon cases at almost any sporting event. Considered a bad beer by many (see spriggy above) but I quite like it.
Tooheys - Several different varieties (New, Draught, Old, etc) Similar to VB but possibly with a little more class.
Crown Lager - Quality beer. I think more people drink it simply because they can afford to rather than for the taste.
XXXX - Very popular in QLD, don't see it much anywhere else.
Then there's Hahn premium, Carlton Cold/Draught, James Boag, and the usual imports. I'd go into them in more detail but I'm getting really really thirsty.