Hi,
Last year I did a presentation at my local .NET user group meeting on CSLA.NET and CodeSmith. Here's my blog post about it and a demo project.
We have used this model for two huge projects resulting in very high quality code. We are able to put all of our business logic in our business objects and test them with unit tests (the way it should be!).
http://codesmartnothard.com/PermaLink,guid,19ca6b91-1d6a-4b9e-83a7-c120654e6bf5.aspx
CSLA.NET Rocks!
Mike