On the BBC website their is link to five live radio, but it wont let anyone from outside the UK listen to premier league games. You can usually listen to the FA and Carling cup games though.

Also you can usually get a game on saturday night on the BBC world feed. It is 630 on the am band in Sydney. Another place you can try is radio 2, they also usually have a game on saturday night. That station is 1611am in Sydney.