does Google take geophysical location into account when it rank a site?  The physical location of the IP address doesnt really matter. The location of the host does. It only really does if it physically closer because it makes the download time quicker.  Make sure you target users in Australia in site configuration in Google Webmaster Tools and hosting to your target audience is best.  Make sure Google knows!  Google does know where you are, and thats not a bad thing, dont get all “Big Brother” about it.

Use your description tag on product or target pages, use alt tags for Google to read if you have allot of images.  Use Page Titles as a sign post for Google as to what you do.  Full description in the page link and a full description in the url.  Frequecy of key words and key word definition give more copy around those indivudual pages.