(This article was first published on simon jackman's blog » R, and kindly contributed to R-bloggers)
The AEC makes this reasonably easy, as do the authors of some very helpful R packages, the good people at Google Maps etc.
Full description here (PDF); entire collection here; a sample here, showing Green 1st preferences, by polling places across metropolitan Melbourne:

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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).