Google gathers information from different sources across the web and matches with the information you provide for your local business in Google Places. Commonly called NAP (Name, Address and Phone Number) has to be correct and consistent both in online and offline world.
When you provide details of your business to other sources like local directories, you need to make sure that you do not have conflicting data with Google Places listing. Citation of business details are correct for Google bots and for customers as well.
There are many sources for providing details of your local business in Australia.
and many more.
Here's Ten Things in Google Places to take care of.
We know Reviews in the Google Places are important for ranking in Google local search. Similarly reviews for your business in other sources also are helpful. Happy customers are always happy to leave reviews for your quality services.
Also Search quality highlights: 40 changes for February 2012