Speedrenting is an awesome way to find flatmates. It's free.

You just turn up at the bar and if you're looking for flatmates you get a Gottaroom sticker. If you're looking for a place to live you get a Needaroom sticker. You make the rest happen... 

If you've advertised for flatmates on Trademe you can tell everyone to meet you at Speedrenting. That saves the hassles of screening calls and people not showing up etc