Imagine the potential if land title information could be mashed up with other geo data. Simply having the geo location for every street address in Australia freely available would be incredible. Imagine if you could find out how the property is zoned, maybe who or what owns it.
To the best of my knowledge all this information is kept at the state/territory level.
See for instance (for Victoria) http://services.land.vic.gov.au/landchannel/jsp/map/InteractiveMapIntro.jsp
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