There's two interesting results that this election might throw up. The first is a hung parliament, as discussed by other contributors to this august wossname. Bring it on, I say, even if it means crazy Bob Katter is holding the reins.
But perhaps even more interesting would be a repeat of 1990 and 1998: an overall majority vote for one party, who nevertheless fail to gain a majority of seats. Perhaps we might get the quinella -- a parliament that is hung even though either Labor or the Coalition gained an overall 50%+1 against all other parties, but were still denied the automatic first go at forming government.