Glenn Block recently did a great screen cast on the Managed Extensibility Framework.  Show #130 | 11/26/2008 Glenn Block on MEF, the Managed Extensibility Framework Glenn Block shows you how to use MEF to allow a plugin architecture in your .NET applications. The framework is extensible enough to allow any type to be imported and exported as managed plugins, which are called parts. Read More...

Read the complete post at http://blogs.msdn.com/brada/archive/2008/11/30/dnrtv-does-mef.aspx