Are you waiting for the Windows Mobile 6.5 SDK before developing your application for the marketplace? There's no need to wait as most of the functionality is already available in the Windows Mobile SDK now. The only thing you can't access with it are Widgets. But according to Steve Bell of Microsoft this summer a Developer Resource Kit will be release to update the SDK. It will include guidance on writing widgets and accessing other WM6.5 features.
via MSDN Marketplace Forums
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