Well, so much for the idea that two-party systems produce stable governments. Canada and the UK had already beaten it senseless, but Australia just fired a shotgun round in its temple.
(Or, as was so eloquently and clearly said by the Australian electorate, "mbgffhf and also gghg vvjjv jmmbmbmbff". Words to live by.)
In any case, a lot of this is because the Greens apparently had a breakthrough. So, hey, maybe Nader's old crew should step it up. Looks like America might have the only two-party system left.
Edit: Yes, yes, technically Duverger's is about straight-up FPTP systems, and Australia's lower house uses IRV. Even so.