@Max *******
New Zealand does require proof of onward travel, unfortunately. For their most common type of visa, that is.
Australia stands pretty much alone in their reasonable approach. Only three countries kind of match this, all near Thailand: Cambodia, not requiring proof of onward travel from citizens of decent countries (though they do require it from Ethiopians, Somalians, etc.), Vietnam, requiring it only for their 15 day visa exemption but not for 30 day visas and up, and Laos, not requiring it under any circumstance (even more lax than Australia which still requires it for their transit visa, which, let's be fair, is nothing but reasonable).