Google has handed out bouquets to New Zealand ISPs whose customers should be able to watch high-definition YouTube videos without buffering.

This list of ISP's who are "HD verified" include:

Orcon UFB Service
Slingshot UFB service
Telecom UFB Service

The list of ISP's who are Standard Definition SD (Still really good)

Actrix
CallPlus
Compass
Flip
HD
Inspire
Megatel
Orcon DSL
Voyager
Snap
Worldnet
WXC

Check your results here:
http://www.google.com/get/videoqualityreport/