I lived in New Zealand and moved to Australia when I was 12... BEST THING MY PARENTS EVER DID!
The education system, whilst slightly flawed, is excellent and I have a much better education from the schooling I did here, than what I did in NZ.
FREE PUBLIC HEALTH SYSTEM. What more can I say? You seriously cannot go wrong with it. Again, definitely a flawed system... but if I am sick it doesn't matter how much I earn, where I stand on a financial level - there is free, adequate health care.
Incentive packages! Things like the first home buyers grants, the baby bonus. Things that make some dreams just a little more attainable.
We have hell wicked accents ;)
The coast, the outback... everywhere has something unique about it.
And of course, the general laid back and easy going nature and lifestyle of people.