A good friend shared with me this interesting link on Volta.
Interesting way to separate an app into mult-tiers using annotations..
"Volta is an experimental developer toolset that allows developers to build standards-conformant, multi-tier web applications using established .NET languages, libraries and development tools. Via declarative tier-splitting, developers architect their applications as a single-tier application, then make decisions about moving logic to other tiers late in the development process- letting the complier manage creating boilerplate code such as communication between tiers. The programmer can still debug and test the application, much as if it were still on the client-tier, because Volta's tier-splitting is deeply integrated with Visual Studio 2008 and the .NET Framework 3.5. In summary, Volta extends the .NET platform to distributed software+services applications, by using existing and familiar libraries, languages, tools, and techniques. "