The final release of ASP.NET MVC 2 is now available for Visual Studio 2008/Visual Web Developer 2008 Express with ASP.NET 3.5. ASP.NET MVC 2 introduces extensible client-side validation, enhanced model validation, asynchronous controllers and several other key features, which all help developers quickly build rich Web sites and applications. Go here for more details and download links. Microsoft also released the source code to ASP.NET MVC 2 under the Ms-PL license, an OSI approved Open Source license. To learn more and grab the source code, go here.