ASP.NET MVC 2 RC 2
From Microsoft: ASP.NET MVC 2 provides a Model-View-Controller (MVC) framework on top of the existing ASP.NET 3.5 SP1 runtime. It’s a framework for developing highly testable and maintainable Web applications by leveraging the Model-View-Controller (MVC) pattern. The framework encourages developers to maintain a clear separation of concerns among the responsibilities of the application — the UI logic using the view, user-input handling using the controller, and the domain logic using the model. ASP.NET MVC applications are easily testable using techniques such as test-driven development (TDD).
The time to provide feedback on this Release Candidate (RC) will be very short as Microsoft is fast approaching the Release-to-Manufacturing (RTM) version.