I spent hours on http://www.matapihi.org.nz when I first discovered it. Mainly because the search function is slow and clumsy to use. I sourced some great old photos of Island Bay taken 100+ years ago from pretty much where my flat is now. I find old photos of familiar places very fascinating.
I wish the film archive http://www.filmarchive.org.nz would digitise more of its collection and put it online. What's already there though is worth a browse.
The changes to the Radio New Zealand / NatRadio site http://www.radionz.co.nz are top-notch as well.

There was a 1970s pop culture exhibit at Te Papa a year or two back which had a reel of old 1970s TV commercials playing in a loop on an old TV. When this ad came up in the rotate it always drew a crowd - the 30-somethings especially liked it having been small kids at the time it aired. It's probably the second most fondly remembered ad of the '70s, the first of course being the Crunchie Train Robbery
http://www.duncans.tv/2005/film-director-tony-williams

I'd love to see the old Crazy Joe Cola and the original Pop-pop-pop-sicle Band ads again if anyone knows where to find these online.

You can find a wmv of the ad here ... URL: http://homepages.slingshot.co.nz/~steve.hall/hugo%20medium%20quality.wmv