On day 2 of PDC2008, the Silverlight toolkit was announced. This release features a series of controls that were only available on WPF and adds charting controls (both static and dynamic). These charts are part of Microsoft's open source program, so the source code will be shipped with the controls as well.
Another announcement was the tighter integration between Silverlight and Visual Studio. VS2010 will ship with a fully integrated Silverlight designer and WYSIWYG editor.