How to cool housing hot spots, Down-Under style

WELLINGTON/SYDNEY, May 21 (Reuters) - Australia and New Zealand are looking outside traditional monetary policy to do the same thing -- cool red-hot housing markets in their biggest cites without hurting borrowers, banks and their economies -- but they are following different paths. The success, or not, of these experiments could prove critical to the outlook for interest rates in both countries, while offering a guide to other rich nations on how to manage housing booms when the broader economy still needs support.