Just an FYI as was looking at this and New Zealand used to be the only country which received a 90 day stay exemption. Now they're off the list and others on. This is from the official Thai site: http://www.mfa.go.th/web/2482.php?id=2490 Pete
"Thailand holds bilateral agreements on visa exemption for holders of diplomatic, official and ordinary passports for a visit of not exceeding 90 days with Brazil, the Republic of Korea and Peru. Therefore, nationals of these 3 countries are exempted from visa requirements and are permitted to enter and stay in Thailand for a period of not exceeding 90 days."
Governments are instituted among Men, deriving their just powers from the consent of the governed. Source