For all Down-Underers, it's interesting to see that
amazon.com.au is now a happening thang.
So far, it only has Kindle devices and mobi/azw ebooks (which is why I'm mentioning it here). For those titles I compared, the prices (expressed in $AU) are the same as those on the US page, to within a cent or so.
I can't recall any titles that are geolocked from AU/NZ purchasers on the US site, to see if they're present on the AU one.
Interesting times, indeed.