Cable
Cable TV/internet and phone services are available from TelstraClear services in Wellington and Christchurch. The ISP used is clear.net.nz

TelstraClear cable setup and configuration can be found here.

Broadband Fibre to the home/business
Business Internet Access from TelstraClear (Major centers only) 10/100/1000Mbit ethernet.
Corporate Internet Direct from Telecom/Geni/Globalgateway 10/100/1000Mbit ethernet.
Citylink in Wellington/Auckland Public LAN(10/100/1000Mbit ethernet.

Wireless
Wireless Services are available from several companies here is a few
Araneo
Rural link
GoLive in the Hamilton Area
Woosh

Modem
Most NZ isps offer Dial-up access

DDS - Frame Relay - ISDN - ATM
All reliable and stable sources for internet and/or phone access but costs are high compared to ADSL.