I just checked out the Australian Tourist Commission web site (http://www.australia.com). Quite attractive and well laid out.
They give you the opportunity to pick your language and your country. I was pleased to discover (insofar as I looked) that the English language versions for Canada and the UK use metric units only. However, I was disappointed to see that the USA version appears to use US Customary Units only. I took the opportunity to send them feedback suggesting that they switch the version for the USA to a "metric (US Customary)" format. I proposed to them that the USA is converting (albeit slowly and voluntarily) and that such a format sends the appropriate message to expect to find a metric country when visiting Australia. I'll let y'all know if I get some sort of reply. Cheers, Ezra