In reply to IainRUK:
mountainz has not been active for quite a while now - the operators of it shut it down. A pity because it was a useful resource and more active than mojozone. Mojozone does have a "mountains" forum, but overall it is not as active as mountainz was.
Mojozone is currently the only online forum in NZ. the NZAC are transitioning into a new one (climber.co.nz, I think) but I don't know when that's going to happen - they've been talking about it for a while.