This is a great facebook page setup by the NZ tourist board if you are stuck in NZ!
There are loads of people offering free accommodation to those who are stuck and also loads of businesses offering big discounts and freebies....
"Email [email protected]
and quote FB offer to receive 50% off best flexible rate at Crowne Plaza Auckland in Auckland CBD.... Limited offer so dont delay and book today. Offer subject to availability."
"2 for 1! Gray Line NZ are offering stranded passengers 2 for the price of 1 on our Day Tours to the Bay of Islands, Waitomo & Rotorua Deluxe Day and Auckland Sightseeing Tours. Call 0800 698 687 (0600-2300) 7 days a week. Proof of delayed flight details needed."
Loads more too.
Hope this helps someone!