Our forefathers observed that Australia is a big country with long power runs and people who are hard to shock. Both are still true. For this reason, power reticulation was chosen to be higher voltage/lower current. And the philosophy works: it is uncommon in Australia to see lights dim just because a clothes iron or electric kettle is turned on. Check out this bit of fascinating history re differing power standards.
Australia uses nominally 240V 50Hz supplies, well within the switchmode-friendly zone. Power points in Australia are polarised with an earth pin, and generally with a switch. The arrangement of the plug conforms to international standard type “I”.
Adaptors which accept other plugs and have Australia-format pins are relatively common, and can be purchased at travel stores, supermarkets, hardware stores, and many convenience shops. Paddy’s market in the city is a good source of cheap adaptors which will work about as well as cheap adaptors do.
In case you think that we’re weird in selecting a non-standard plug (whatever that means) consider that we share the connector with New Zealand, Fiji, Argentina, China and a heap of little Pacific countries. Your .tv domain might well run on Type I sockets if the server is located where the TLD is housed.
Little known fact: the Type I arrangement was designed by Hubbell for US use, but never taken up there. You can read about that here.