When it comes to Australia, one of the first things you (should) will notice about Australians is their sense of humor. Overall, most Aussies like to have a bit of fun and stir people up a bit. If you are easily offended, then Australia might not be the place for you.
Poms, Kiwis, and other Non-Aussies
Australians are the first to make fun of everyone - including themselves. Thus, it only makes sense that they come up with nicknames for people from other countries (and for each other).
Here's a quick list of what you might be called when you get to Australia.