Silverlight 2 ships with dozens of built-in UI controls that can be used to build applications.  Below is a screen-shot of the Silverlight DataGrid, RadioButton, CheckBox and DatePicker controls in the final release:

Figure 1

Today we are also announcing the "Silverlight Toolkit" - which will deliver dozens of more controls that you can use with Silverlight 2.  We will continually add new controls to the control pack over the next few months (we expect to ultimately have more than 100 controls total).  The first release of the toolkit will include controls like TreeView, DockPanel, WrapPanel, ViewBox, Expander, NumericUpDown, AutoComplete and more.  All controls will ship with full source, and with a OSI license that allows you to modify and use the source for any purpose.