Not only have the international capital markets taken a better view of Australia, but we also seem to have more confidence in ourselves. Business and consumer confidence initially fell as the Asian events unfolded, but they did not fall excessively - for the most part they fell from well above average to about average.
In the past three months, they have tended to rise moderately again as figures about the economy have confirmed that it has performed better than most expected. The fourth explanation for why growth has held up is a catch-all one - the economy just seems to be more flexible and adaptable than before.