[EDIT: working with sydney & oregon servers. Something up with NZ one?]
Nah its just Akamai it sends you to the closest server based on the dns servers location, so by changing the dns server you get given a different Akamai caching server. There is usually a flow on effect when netflix has and issue so it might have already passed the AUS server.
Ahhh - that's a useful piece of "how it works" information for future reference - thanks! :)