C at Work: Writing, Loading, and Accessing Plug-Ins -- MSDN Magazine, October 2005

This article talks about how to create a plugin framework using .NET. It also goes into details of how a Native application can be made to load up plugins written in .NET languages. (http://msdn.microsoft.com/msdnmag/issues/05/10/CatWork/default.aspx) Also of interest is an articel referenced here that talks about optimizations that can be made for such scenarios. Joel Pobar from the CLR team wrote a terrific article for the July 2005 issue of MSDN Magazine (Reflection: Dodge Common Performance Pitfalls to Craft Speedy Applications)