Our currency at the moment is pegged to resources, and in the last few months Gold and Oil (as the most significant two) have lost about 30%. On top of that, the speculation that we could have 1-3 interest rate cuts by the end of this year (drop in oil price is expected to ease inflation slightly) means that investing in the AU$ would be a bad idea, until rates are expected to plateau or go back up (because the investment in the currency or any AUS asset by foreign sources won't be worth as much by the end of the year).
Our currency has dropped by against most major currencys in the last few weeks, including the yen, Euro and Pound.
My opinion is that we will stabilise when the oil and gold rate stabilises, and I doubt we would reach parity with the US$ unless a major disaster drives oil up again, our our inflation rate blows out (driving up our interest rates).