Do not get worried when you see final decisions taking a little long in Australia, as seniors are consulted before taking any final decision. Being patient is very important.
Be prepared for people using informal language even in business meets, as unlike most of the countries, it is acceptable in Australia.
Do remember that Aussies do not say No to extra work no matter how busy they are. They manage to do it by making time.
While doing business with Aussies, make sure that you keep in mind that Australian people are quite straightforward and they talk to the point.