If you want to learn about the Australian Parliament, you can get some great information from the Parliamentary Education Office. The Education Section of the Parliament of Australia web site also contains useful information and you can find out about the Australian electoral system from the Australian Electoral Commission.
The Australasian Study of Parliament Group publishes a journal biannually and holds an annual conference about parliamentary institutions in Australia and the South Pacific.
If you are looking for general information about Australia you can access a wealth of statistics from the Australian Bureau of Statistics. Statistics gathered by the Bureau help Federal, State, Territory and Local Governments plan how to best allocate government services. The Bureau also sells statistical information to private organisations to help them make decisions, such as where to locate their business.