supplier did not delivery the goods after received payment

First, send the supplier a letter urging them to deliver the said goods immediately as payment had already been received in a normal course of business. See if there are some reason for the non-delivery e.g. supplies or goods are unavailable?
If no reply or feedback be received, ask them to remit back the money to you and then the cancellation of your ordering of these goods.
Unless you have a good knowledge of your supplier, it is quite a difficult issue for the performance of him being far away and not governed and could act under the local jurisdiction.

2008-08-05 22:46:44 補充：
If the amount involved is significant, it is worth for you to seek a local lawyer with knowledge on Australian law to study your case in details. Send him a legal letter first or even to seek the legal advice to justify a legal action to be taken against the supplier in Australia thereafter.