I am not too familiar with New Zealand, but if you are looking for a job, you have a couple of options. If you are a PADI Professional then have a look at the employment board on
PADI. The Way The World Learns to Dive, you have to log in as a PADI member. You go to the PADI Pro site and then follow the link to "members toolbox", click on it and follw the instructions. There is also
divejobs.com: The Leading Diving Site on the Net which might be of any help. There is various ways to get information on dive jobs. What also might help is to get on the dive centre listings in a prticular area, and then individually call or email the dive centres asking for any vacancies. When you do email any dive centre asking for a job, I suggest you include a current CV with a picture. If you need any tips about what should be included in an effective CV then send me a private message on this board.
I hope that helps and good luck.
DiveDevil