Written by an expatriate Australian this site contains a useful list of tips for Aussies looking to live in the US. The site covers some common topics such as customs and traditions, differences in language, standards, road travel and food. While you might think that there isn't too many dramatic differences between Australia and the US you might be surprised by a few of the cultural differences that do exist between the two countries.
By no means should you take the information on this site as universally accurate across the US, and some information provided may be more opinion than fact, but the website does provide a good general guide to some issues you may not otherwise be aware of.