http://apo.org.au/
APO is a research database and alert service providing free access to full text research reports and papers, statistics and other resources essential for public policy development and implementation in Australia and New Zealand.
http://anzlic.gov.au/
The peak intergovernmental organisation providing leadership in the collection, management and use of spatial information in Australia and New Zealand.
http://www.bom.gov.au/climate/data/
This site, hosted by the Australian Bureau of Meterology, provides access to a range of statistics, historical weather observations, climatology maps, and other Australian climate data.
http://www.ga.gov.au/
This is the site of Australia's national agency for geoscience research and geospatial information. Geoscience Australia is an excellent online source of maps, images, data, publications and news.