The Olympics aren't over, we can and may beat out China for the gold medal count in the end. One thing is for certain, we will beat Australia
Its a given that the USA will beat Oz. No contest there. We still do pretty good for ourselves for a country with the population of little over 20 million.
I know the track and field hasn't started yet so you've still yet to get the majority of your medals but I think China are an honest threat for you this year. Its a matter of national pride for them. From what I've read they've made a point of loading many of the non-US dominated events with their athletes. It would be a great moment for them to top the medal tally at their own Olympics.
Although our TV coverage would have us believe that Australians are in every event. Still no weightlifting on TV (although I was at work and the gym for most of the day).