To prepare the Trail,
The TAT (Te Araroa Trust) website is inevitable: http://www.teararoa.org.nz/
It procures the detailed and inevitable trail notes as associated trail maps.
Jpeg datas represent a considerable source of information and maps.
Moreover TAT publishes regular updates and information about the trail.
The “Walking Guide to NZ Long Trail” could be found on the web thanks to Its ISBN referece.
It summarizes de TAT data. It seems to me to be only a preparation guide and not a book to bring in your backpack.
Nevertheless it is interesting to compare the TAT’s and book’s descriptions.
Finally interesting forums, private Tramper’s blogs and a dynamic Facebook group complement each other and bring interesting and occasionally precious information, experiences and details.