ASP.NET MVC Preview 2 and Updated Silverlight ASP.NET Server Controls
You can download the new ASP.NET MVC Preview here. The updated Silverlight ASP.NET controls get installed along with the Silverlight 2 SDK Beta 1 (or Silverlight Tools Beta 1 for Visual Studio 2008 which includes the SDK). For these downloads go here.
The readme for the ASP.NET 3.5 Extensions has been updated to reflect these changes. It's recommended that you uninstall previous versions before installing the new MVC bits or Silverlight ASP.NET controls. Of course this might not be practical as the ASP.NET 3.5 Extensions contain many other bits (eg Dynamic Data support, ASP.NET AJAX enhancements, ADO.NET Data Services etc). If you don't uninstall, you could / will end up with duplicate template / toolbox items. Just a warning to make sure you're aware of this and are careful to use the appropriate template / control to avoid getting into a mess.
I'm going to install the MVC bits now - I'll let you know if I run into any showstoppers...