First -- there is a good database collection of links to online cemetery information already: Kiwi Celts NZ Cemetery Database. There are some broken links, but hey, these councils keep changing and amalgamating, so no surprises there.
There is a collective site for territorial authorities in NZ: Local Councils. Handy links, divided by region, lead you to your local council website, and what goodies they can provide to the nomadic researcher.
Here are some of the excellent map sites. where you can zero in on specific properties and get legal descriptions to further the research.
Far North Maps
Whangarei District Council GIS Maps
Auckland Council GIS Viewer
Environment Waikato Maps:
Go to Districts tab, select, and it will take you there.
Bay of Plenty Regional Council Maps
Gisborne District Council Map TV
Taranaki Regional Xplorer
Palmerston North Geo Guide
Wanganui District Council Exponare
Porirua City Council
Wellington City Council maps
Kapiti Coast District Council Map Images
Tasman District: Top of the South Maps
Marlborough District Council: Dekho Maps
Environment Canterbury (Canterbury Regional Council)
Dunedin City Council webmaps
Queenstown Lakes District Council maps
Invercargill City Council Xplorer