I came across this most excellent application on the Something Awful forums.
Basically it is a free web based application that allows users to upload and view speed camera locations.
http://njection.com/speedtrap/
There's also an iPhone version - but it costs a few bucks through the iTunes app store.
I did a few quick searches and it looks like people have started loading speed camera locations for Auckland, Hamilton, Wellington, Christchurch, Dunedin etc.
Enjoy!
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