Like a lot of things in Australia, flying domestically is a much more laid back experience. To fly domestically within the States, at least as a Canadian citizen, is quite a stressful process. I always felt like a bit of a terrorist (I swear I'm innocent!) with all the strict rules and regulations. It's a much bigger hassle and security often seems quite impatient, impersonal and grumpy. In Australia you can bring your groceries on the plane with you (a very good thing when you're backpacking) don't have to put all your liquids in baggies and you can keep your shoes on when going through the metal detector! It's also much cheaper to fly around Australia than it is in Canada, with the lowest flight from Sydney to Melbourne costing in total around $50 AUD. The draw back with these cheap flights though, is that they charge you for everything beyond the basics, such as checked luggage, in-flight bevvies and paying for it all with anything aside from a few select methods will cost you a little extra coin.
Also, a cyber high-five to anyone who can tell me what song the title of this post is from!