This past Thursday the ASP.NET MVC feature team published a new "Preview 5" release of the ASP.NET MVC framework. You can download the new release here. This "Preview 5" release works with both .NET 3.5 and the recently released .NET 3.5 SP1. It can also now be used with both Visual Studio 2008 as well as (the free) Visual Web Developer 2008 Express SP1 edition (which now supports both class library and web application projects).
Preview 5 includes a bunch of new features and refinements (these build on the additions in "Preview 4"). You can read detailed "Preview 5" release notes that cover changes/additions Go to the complete details ...