Very good blog about cycle touring in general (including articles about NZ)
Traveling Two Blog
Independent Guide for cycle touring in NZ
Cycle Tour New Zealand
NZ cycle touring/mountain biking guides (books)
Kennett Brothers
Inspiring cycle touring blog from a couple with babies
Le Monde a Bicyclette
Very professional blog about touring with mountain bikes and not only
Bike Packing
Nice and cheap campgrounds, huts, tracks and walks in NZ
Department of Conservation
Useful application to find accommodation while touring
Wiki Camps
Precise Weather Forecast in NZ
Met Service
Blogs of people we met on bikes