A small but handy time saver: if you want to find the postcode for an Australian town, enter its name and the word 'postcode' into Google and it will now tell you automatically without needing to delve into other sites.
The search is a little finicky -- if you put the word 'postcode' first, Google doesn't provide its own result, and it doesn't work for town names that exist in more than one state. However, it's still useful, and if you combine it with a Google-enabled browser search box, then you've got instant postcode lookup on your desktop. Neat.
Google postcode results for AU: productivity booster [rainbowtatt]