Online currency exchange rate thingie
You are exposed to exchange rate risk, while a net teller account will fix some of this, you will still be exposed to the risk that the Australian dollar will appreciate in value while you have your money in your net teller. I wouldn't be too worried about that though, I can't see the Australian dollar appreciating any time soon, if anything get your money into US dollars know while its still a reasonable $0.75 to the $1!
The Eureka Kid=============="Concentration and mental toughness are the margins of victory."