Microsoft an ASP.Net MVC "Sample" (or is it a starter kit?) source code that can be used by Web developers to build blog engines into sites ... it's called "Oxite" and it's the software running the blogs on MIX Online. http://www.codeplex.com/oxite
"MVC Turbine is a plugin for ASP.NET MVC that has IoC baked in and auto-wires controllers, binders, view engines, http modules, etc. that reside within your application. Thus you worry more about what your application should do, rather than how it should do it."