Rich, the haka these days, like many other Maori traditions including the language, is taught in most schools across the country. Most secondary schools seem to have their own distictive haka that they learn, and will perform at inter-school sporting events to spur their team on, or at other functions, etc. Anyone and everyone who wants to these days can usually learn it at school.
Top notch. I only wish British schools were as attentive to their culture and traditions.