In search of Australian style

After 200 years of history, Australian English has established itself as a distinct variety of the language. Its accent and idiom are now recognised round the world, on the lips of traveling Australians as well as the fictional characters of Neighbours. But what about written Australian English? How does it compare with British and American English, on variable spellings (such as those of the second sentence above) and other points of style? Is there an Australian style, in the sense of "house style", a common code to which editors and writers down under may adhere?