I'm about to embark on some very different Silverlight application development projects (primary around data-driven UI, and one potential one even about kiosk/digital sign work). Before I do that, I wanted to give you all a brain-dump primer from my last project – MSDN East Coast News. MSDN East Coast News is a Silverlight 2 application which runs inside the Facebook chrome, ergo a two-parter on building Facebook apps with Silverlight.
Coding Library: Silverlight

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