How do you impersonate an Active Directory user in Powershell?

I’m trying to run powershell commands through a web interface (ASP.NET/C#) in order to create mailboxes/etc on Exchange 2007. When I run the page using Visual Studio (Cassini), the page loads up correctly. However, when I run it on IIS (v5.1), I get the error “unknown user name or bad password”. The biggest problem that I noticed was that Powershell was logged in as ASPNET instead of my Active Directory Account. How do I force my Powershell session to be authenticated with another Active Directory Account?

How to register a Controller into ASP.NET MVC when the controller class is in a different assembly?

My goal is to modify asp.net mvc’s controller registery so that I can create controllers and views in a separate (child) assembly, and just copy the View files and the DLLs to the host MVC application and the new controllers are effectively “Plugged In” to the host app.