From the ABS is the population statistics for the states. The 2007 stats haven't been released yet.
It is interesting to note on the report that population flows have been matching the states with booming economies. For instance, Western Australia, Queensland and the Northern Territory have to the largest changes over previous years with a 2.1% gain in WA. This suggests some mobility in the workforce in moving to opportunities though none of the states had negative changes, possibly due to immigration working to continue population increases.
Update: I take that last sentence back, oversea migration made up 52% of Western Australia's increase in population, there was almost no inter-state movement to WA either, it was all births or overseas migration. More at clubtroppo.
