Following up from my previous post, and some concerns raised about the legalities of using the Google Maps geocoder, I've managed to find a way to qualify for a free unlimited subscription to Microsoft Bing Geocoder, formerly Microsoft MSN Geocoder.
So if we do hit problems with Google, I have a workable fallback option.
Moving onwards, my biggest problem with the http://geo2gov.com.au/ service has been that I link to census keys which aren't particularly usable for most people.
The Census provides a huge range of information for these keys, but behind layers and layers of web interface. This is fine for basic situations, but what if I what if I want to go watch the Lithuania vs Argentina World Cup match to cheer against Argentina. How do I search for pubs and clubs located in areas or enclaves with high numbers of Lithuanian immigrants, so I can maximise my chance of bumping into others to cheer with?
(This is, of course, highly notional)
Fortunately, at many University libraries you can find copies of this ABS online information compiled into a single file tree. This, of course, still isn't particularly useful because it isn't in easy to use file formats.
So I've fixed that problem with The Database That Ate the Census.
This is a single file download, in either PostgreSQL backup or SQLite formats, of the entire Australian 2006 Census data. Or more specifically, the CD (Collection District) layer of the BCP (Basic Community Profile) subset of the census compilation.