Impressive set of Windows Forms controls for Silverlight, currently under development.
What is GOA WinForms?
GOA WinForms is an implementation of the standard System.Windows.Form .NET library for both Adobe Flash and Microsoft Silverlight. It allows .NET developers to write standard WinForms applications that will run on these two RIA platforms.
GOA - What is GOA WinForms? - System.Windows.Forms for Adobe Flash and Microsoft Silverlight