AndrewP has been producing contour maps (Aus, state by state) for use in Garmin GPS for quite some time - now he's added New Zealand North & South Island maps to the list.
To download, go to : http://tiny.cc/osm-maps
or to read the whole thread on Bushwalk.com, go to : viewtopic.php?f=21&t=28893
For NZ, the hydro, contours, forest, scrub, scree and shingle data are from LINZ and all other data are from OSM.
Thanks AndrewP, great stuff.