Some videos on Biztalk ESB: http://blogs.msdn.com/pkelcey/archive/2009/08/05/esb-toolkit-how-to-video-7-a-sharepoint-adapter-provider.aspx
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Found a paper on WCF impersonation and delegation: http://blogs.msdn.com/mfinley/archive/2009/09/01/using-wcf-to-communicate-between-asp-net-website-server-and-app-server-using-impersonation-and-delegation.aspx
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