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I have built a basic Windows Phone 7 application (source and video below) that works against the open REST based API for Trade Me.
Since then Trade Me has released a full featured API and we have created a Windows Phone 7 developer competition and a starter kit. Check it out athttp://blogs.msdn.com/b/velloso/archive/2010/10/01/game-is-on-the-new-zealand-windows-phone-7-application-competition.aspx
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