The latest installment of Silverlight represents a big upgrade. It utilizes the XAML markup language like WPF. Silverlight is no longer trying to compete with Flash. It is going after the Adobe AIR market.Initially Silverlight was a web development platform. Now it is being pushed for both the desktop and web environments. A big addition to the technology is MVVM, a model similar to the MVC one.
Silverlight 4 will also support the Manged Extensibility Framework, aka MEF. You had best play around with Silverlight 4 in Visual Studio 2010. That way you can avoid any learning curves which may hamper your productivity later.
