yes Carlton Cold is cats piss.
but it has a nastier cousin. this...
... is Carlton ColdShot... beer with a shot of Vodka in it...
pure filth, guaranteed to make your head twist off and explode the next day.
one great drop from those crazy clowns in South Australia is Coopers (Sparkling and Pale)
Tasmanians are a strange group of people... (circular family trees and such...), but they do make good beer...
Cascade was mentioned above in Chris's post, but i'd like to mention Boags.
this is premium drop, and it'll be as expensive as Cascade, but its worth it.
now, i feel i should also mention Home Brewing... which is something of an Aussie past-time.
everyone in Australia either does it, or knows someone who does it.
BEWARE the first time brewer... he will tell you his first batch is great, but it won't be. best wait until he's been doing it for a little while... then, theres a good chance that it'll be a good drop.