Temperatures show a secular increase that is of the same order as that predicted by climate change theorists. But just eyeballing the rainfall data doesn't suggest much of a trend at all.
As a somewhat naive observer this suggests to me that the current drought can be best understood as an errant event rather than a consequence of climate change. It also helps to explain to me the vast range in forecast rainfall effects of climate change.
The Bureau of Meteorology website has much useful information. There are no doubts here about the realities of climate change:
Australia and the globe are experiencing rapid climate change. Since the middle of the 20th century, Australian temperatures have, on average, risen by about 1°C with an increase in the frequency of heatwaves and a decrease in the numbers of frosts and cold days. Rainfall patterns have also changed - the northwest has seen an increase in rainfall over the last 50 years while much of eastern Australia and the far southwest have experienced a decline.Steve's comment challenges this last sentence - at least for Eastern Australia. I'd be very interested in getting commentary on this one.