Personally I am not too concern about the exchange rates in the longer term. I believe Yen will come back up, due to the export. China is buying a lot of goods from Japan, and will continue to buy more. When you have huge export demand, currency should be strengthening, not weakening. If the Chinese Yuan appreciates, the Yen vs. USD will appreciate too, given the more demand of Japan products, however, I guess the same applies to AUD.
That's just my thoughts, haven't done much quantitative analysis. DYOR.
Cheers.
snowfree
AJA Price at posting:
36.5¢ Sentiment: LT Buy Disclosure: Held