Trying to find a working anonymous proxy in Oz has proved to be difficult. The only one I've been able to connect to (albeit VERY slowly) is at 203.148.95.71 (Port 80).
The following instructions are for Firefox. If you're not already using it as your browser, switch now:
http://www.mozilla.com/en-US/firefox/new/
Click these:
Tools > Options > Advanced > Settings > Manual proxy configuration ('radio button')
In the 'Http Proxy' box type 203.148.95.71
Alongside that, set the Port to 80
Click OK twice.
Then go here, which will reveal the (apparent) location of your computer:
http://whatismyipaddress.com/
(It will probably take ages to connect, but it should say Australia).
When you want to get rid of the proxy setting, repeat the above instructions but simply select 'No proxy'.
Chris