This is such a huge subject, which can be the source of great amusement, as well as great frustration. From the light switches being "upside down", to tap (faucet) confusion, to language differences (yes, there are many), to your first supermarket experience, it can be one of the most frustrating parts of moving to the U.S. Most of us fight the differences and complain loudly. But every one of us has learned that the sooner you accept the differences, and stop expecting America to conform to Australian standards :), the sooner life in the U.S. becomes easier.