In a few months I will be returning to Australia and I'm wondering how easy it is to get money on and off an exchange there?
For larger amounts, of course, wire transfer is the fastest / least expensive. Mt. Gox or other exchanges offer this.
In addition to Spend Bitcoins there is BitPiggy (though they've had problems with their bank on and off). CryptoXChange is based in Australia, though I don't know if they offer an AUD withdrawal method. They do take AUD cash deposits.
The list of options for selling (cash-out) bitcoins:
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http://en.bitcoin.it/wiki/Selling_bitcoins