At present alot of the past great Whakapapa sites seem to be offline, but here are a few:
NZSG Maori Special Interest Group http://www.nzsgmig.com/
and their resource Links page but several links no longer work
Waikato Uni have a names database collected by Rev. Henry James Fletcher (1868-1933).
Maori marriages at http://marvin.otago.ac.nz/marriages/maorisearch.php
Maori land information sites:
Te Puni Kōkiri (Ministry of Maori Development)
MAORI LAND ONLINE - surname searches
MAORI BMD registrations: remember these are available on separate fiche to the general BMD fiche. Many NZSG branches & libraries have a copy of these.
HAURAKI MAORI TRUST BOARD: wonderful online site including digital oral histories that can be viewed/listened to online
NGATI MARU: site with contacts
Wonderful Books with whakapapa:
Te Takoto O Te Whenua O Hauraki - Hauraki Landmarks by Taimoana Turoa, Edited by Te Ahukaramu Charles Royal. This book includes alot of information on places as well as people.
Waihou Journeys, The archaeology of 400 years of Maori Settlement by caroline Phillips. An excellent read to give background on the area and major settlements.
Maori Peoples of New Zealand. Te Ara The encyclopedia of new Zealand. A wonderful quick reference book for all tribal groups and contains alot of early whakapapa.
Nga Taonga O Te Kauaeranga - Maori Heritage of Thames by John McEnteer & Taimoana Turoa 1993. This a comprehensive review of maori heritage sites around Thames.
Hauraki Contested 1769-1875 by Paul Monin. Excellent resource covering the history of the area.
All the above books are available at The Treasury and the Thames Library.