Yachting New Zealand :  http://www.yachtingnz.org.nz/Home.aspx

Windnet (Wind conditions at various Christchurch sailing sites) :  http://www.windnet.co.nz/

Useful forecasts, and live conditions anywhere in the world : http://www.wunderground.com/wundermap/

Met Service Marine Forecast : http://metservice.com/marine/recreational-marine/christchurch

Tide Info : http://metservice.com/marine/tides/index

Useful Knots : http://www.realknots.com

Lyttelton Weather Site : http://www.lpc.co.nz