Mashups revisited

The mashups that I found through blogger seemed fun and have been added to my list of things to do when procrastinating :D but I hadn't really seen any really useful purpose behind them.

So, while I was wasting time online taking a micropause from my two assignments I came across these nifty and useful mashups:
Google maps + Craig's List = http://www.housingmaps.com/
Google maps + Chicago PD crime database = http://www.chicagocrime.org/

Well.. useful to people in the States. But a New Zealand equivalent would be great. I am beyond abysmal at remembering where the different suburbs are in Auckland and something similar would be invaluable in helping me find that perfect westie bogan flat of my dreams...