I recently completed a .NET Rocks TV show with Carl Franklin. In this episode I discuss some design decisions that will help you create architecturally sound Windows Phone applications. Of course, many of the techniques will also apply to Silverlight and WPF application development as well. Check out the episode at

http://www.dnrtv.com/default.aspx?showNum=184

Good Luck with your Coding,
Paul Sheriff

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Visit http://www.pdsa.com/Event/Blog for a free video on Silverlight entitled Silverlight XAML for the Complete Novice - Part 1.