Microsoft Axum for .Net

Build Parallel Applications using Axum

Axum is a language that builds upon the architecture of the Web and principles of isolation, actors, and message-passing to increase application safety, responsiveness, scalability, and developer productivity.
Other advanced concepts we are exploring are data flow networks, asynchronous methods, and type annotations for taming side-effects.

You can learn more about it at http://msdn.microsoft.com/en-us/devlabs/dd795202.aspx