Creating a Plug-In Framework
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/pluginframework.asp
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/pluginframework.asp
http://www.icsharpcode.net/OpenSource/SD/Default.aspx
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/pluginframework.asp
http://msdn.microsoft.com/msdnmag/issues/03/10/Plug-Ins/default.aspx
http://www.divil.co.uk/net/articles/plugins/plugins.asp
http://msdn.microsoft.com/msdnmag/issues/02/07/CuttingEdge/default.aspx
http://www.icsharpcode.net/