As @Captain Ketamine says, there are so many micro breweries in Oz these days, it would be hard to say, there are lots.just curious, what are good beers down there?
But in terms of mainstream beers, my favourite is Coopers sparkling ale(red label), fermented in the bottle. Most popular of their range would be the green label, the stout (yellow label) is great in winter.
Coopers Brewery - Our Beer
Ales & stout, lagers & low carb, seasonal and lower alcohol beers. The Coopers range has you covered no matter your preference. View the range.