Singapore Customs periodically issue well written e-newsletter, I like it very much.
According to the latest news letter "inSYNC" 9th edition issued on August 18, 2010, Singapore have mutual recognition agreement of AEO (*) with Canada and Korea.
(*) Singapore call it as "Secure Trade Partnership - STP", and Canada call as "Partners in Protection - PIP", while Korea call as AEO.
Actually this is not so new information, as it was announced on June 25, 2010. It is same timing I drafted the Japan- EU, and Japan - Canada AEO mutual recognition. Perhaps, I heard Singapore's mutual recognition at that time, but it completely slipped out of my mind.
This article of AEO mutual recognition is neat and concise, I love it. We can know the essence of Singapore AEO system at a glance.
Singapore Customs is currently engaged in discussion of mutual recognition with China, Japan, New Zealand and the United States.
Among them, China would be the most challenging one. China have their own AEO systems (ranking the operators in AA, A, B, C, and D) but as long as I hear from reliable source, the actual implementation is still in doubt and the practice is different by port by port.