One of the questions I've had with .NET is where has the COM Scripting Control gone.  Tonight Ingo Rammer helped me see the answer - there's no scripting control, but there is the ability to dynamically compile code.  So instead of using VBScript or JavaScript back in the land of COM, it's not possible to use and .NET language (VB.NET, JScript.NET) to script the application.  This is both a plus and a minus (it's more powerful, but also hard to learn to user).

Check out Ingo's presentation on Extensible Application with Scripting, CodeDom and Reflection.