The January 2010 issue of MSDN Magazine is online with my article covering T4MVC:
Microsoft Visual Studio includes a code generation engine known as T4 (which is short for Text Template Transformation Toolkit). You’ve probably already used T4 templates in Visual Studio without even knowing they were working behind the scenes. In this article I’m going to give you a basic introduction to T4 templates and show you how ASP.NET MVC uses this technology. I’ll also show you how to customize T4 templates to enhance your day-to-day work with the MVC framework
Thanks go to David Ebbo for his help and comments on the article. David continues to improve T4MVC, for example: T4MVC 2.6.10: fluent route value API, shorter way to refer to action, and more
Enjoy!