Australia: Antony Green's House of Reps Calculator , ABC (2010)
The calculator tool has been pre-loaded with the two-party preferred results from the 2007 election, adjusted for redistributions. All you have to do is enter your estimate of the swing, either nationally or state by state, and the Calculator shows you what the result might be. Down the page, the calculator also returns the estimated new margin in each seat. Seats that change party based on your entered swing are clearly indicated.
The link address is: http://www.abc.net.au/elections/federal/2010/calculator/
