What's New in ASP.NET MVC 2

1. Areas  - Splitting up the large applications in to the smaller sections. Area is a package of controllers, views , helpers and routing entries etc


2. Model Metadata and Templated view helpers - providing human readable descriptions to the Model


3. More enhanced Validation , simply by providing "[Required]" declarative attribute to the 
fields


4. Automatic HTML encoding - Supported in .Net 4 Only


5. Asynchronous Controllers - More requests possible using IHttpAsyncHandler APIs


6. Http Method Overriding


7. Strongly Typed Input Helpers - Helps to create the Controls(TextBox, Checkboxes) directly from the Model/