Australian Postcode GIS data

I'm looking for the following data about Australian postcodes, this could be in csv or xml format. - Postcode - All postcodes that surround the postcode - The center of the postcodes latitude and longtitude This is to include all postcodes inclusing post boxes and be based on data from 2002 at the earliest. ## Deliverables 1) Complete and fully-functional data files(s). 2) Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform CSV, excel or XML