A good job application comprises three main sections:

1. Your covering letter 
2. Your résumé
3. Your response to specific selection criteria.

• Strategies for getting employers' attention (ppt, 349kb)

Other university Career Centre webpages also have great information on job applications, résumé , selection criteria and interview techniques.  Here is an example:

•  University of Sydney

For further important information on writing a winning application go to the Graduate Careers Australia web site and follow the link through "Your Application".

For tips on job applications within the Australian Public Service have a look at Cracking the Code factsheets on their website.