I have found this site - it has some interesting stuff on it - particularly in regards to airliner and biz jet movements in and out of NZ. Looks to be right up to date. For example I didn't know there was a Citation Mustang based here - neat little jet.
Edit: Actually there is plenty of military movements noted on it as well. Also see that Air NZ is getting two s/h 737s next year to take their fleet to 16.