Commonwealth of Australia Hansard
The files are made available on the Parliament website under a CC-BY-NC-ND licence.
Currently this repository includes files for the House of Representatives and the Senate from 1901 to 1980. The Hansard file format changes after 1980.
Browse the files or download a zip file of the lot (it's big). For convenience there's also individual zip files for each year.
In the process of harvesting the Senate XML files I noticed that some sitting days seem to be missing. I've documented what I found in my Research Notebook. Almost all of the problems have now been fixed. I think the only day of Senate proceedings now missing is 20 September 1907.
The XML is a bit dodgy in places, so feel free to fork this repository, correct the XML, and send me pull requests.