Apparently vicmaps is allowing their data to be entered into the OSM maps for victoria. Anyone who would like to do things such as add street names and building numbers into the map can go to http://services.land.vic.gov.au/maps/interactive.jsp and zoom down to local level of the map area of interest and transcribe the relevant data from there.
Anyone in other states might approach their public mapping offices to see if their data can be used for the same kind of purpose.
There is an AUS mailing list that you can subscribe to: https://lists.openstreetmap.org/listinfo/talk-au It has quite a bit more traffic than the forum and there was just a discussion on the vicmap data.