Capricornia by Alexis Wright.

Ros says that that the book is on long waiting lists through public libraries and sold out at lots of bookstores. I did manage to get a copy at Hornsby Borders. It was the only one in sight. I haven't started it yet (yes I know I should).

There is an article about Alexis Wright here, and a link to her PEN speech

http://www.abc.net.au/news/stories/2007/07/13/1977989.htm