NETiKA Technologies has developed a set of controls that has WinForms Controls' look-and-feel for Microsoft Silverlight (and Adobe Flash). From their live demos, you can see buttons, checkboxes, textboxes, menus, lists, treeviews, tabs, toolbars, calendars and even DataGrids! It is pretty impressive that they did it before Microsoft does. Formal WinForms-like controls are expected to be shipped by Microsoft for Silverlight 2.0.