Birds Australia/RAOU: BA is dedicated to the conservation, study and enjoyment of Australia's native birds and their habitats.
Fred Van Gessel, Birds Australia/ Australian Museu: Birds in Backyards is a research, education and conservation program
The birdsongs are available online in different formats. In order to listen to them, you will need the appropriate software and browser plug-ins. I recommend Winamp Media Player and the VLC Media Player, both of which can be downloaded for free.