As you may have heard, Trademe are upgrading their multiple-quantity buynow functionality.
Read the Trademe help on this here: http://www.trademe.co.nz/help/737/multiple-quantity-listings–faqs

We have put up a fairly comprehensive guide on how this will effect omins/Easylister use and given some recommendations on how to make the most of the new feature:
http://www.guides.snipesoft.net.nz/?p=1418

We have also upgraded our optimization hints and tips 10 day auto extend guide to add as the new Trademe features mean that 10 day auto extend is a more powerful optimization for under certain situations.
http://www.guides.snipesoft.net.nz/?p=906