<p>I want to build an ASP.NET MVC application with Boo instead of C#. If you know the steps to configure this type of project setup, I'd be interested to know what I need to do. </p>

<p>The MVC project setup is no problem. What I'm trying to figure out how to configure the pages and project to switch to use the Boo language and compiler.</p>

So there are two levels of "work with Boo". One would be all the code (namely, the Controllers), and the other would be the views.
For the code, I assume Boo compiles to standard .NET assemblies, so simply properly following the naming conventions using by ASP.NET MVC should allow you to write Controllers. You will probably need to start with a C# or VB version of the MVC web application project template and port some of the boilerplate code over into Boo to get the solution entirely in Boo (I presume Boo supports Web Application projects?).
The other half is views. Someone will need to port the Brail view engine over to the ASP.NET MVC view engine system. This may already be done, but I don't know for sure. If it's not, then this is probably a significant amount of work to be done.
Probably the best place to get answers to these kinds of questions is the
MvcContrib community on CodePlex
.