Visual Studio 2008 Beta 2 and the .NET Framework 3.5 Beta 2 are now available! You can download them here. Read more about this release on Somasegar's annoucement post.What's new in WPF? Here's a non-comprehensive list:

• Application Model

o        WPF builds on the new add-in model in .NET Framework 3.5 Beta 2 to allow developers to create visual add-ins, where add-ins provide UIs that are displayed by the host application. You’ll find the add-in types in the System.AddIn namespace in System.AddIn.dll, System.AddIn.Contract.dll, and System.Windows.Presentation.dll. o        XBAPs can now run in FireFox.o        Cookies can be shared between XBAPs and Web applications from the same site of origin.o        Improved XAML intellisense experience for higher productivity.o        Data binding and journaling by URI work together.

• Data Binding

o        A new debugging mechanism makes it easier to debug data bindings. (new attached property: System.Diagnostics.PresentationTraceSources.TraceLevel)o        The data validation model now supports the IDataErrorInfo interface. (new class: System.Windows.Controls.DataErrorValidationRule)o        Improvements have been made to BindingListCollectionView to provide better support for binding to a collection that is of type BindingList and for LINQ.o        The behavior of data bindings with a CollectionView over an IEnumerable has been improved to provide better performance and better support for binding to results that are produced by LINQ.

• 3D
  • UIElement concepts such as input, focus, and eventing have been brought to 3D. (new classes: System.Windows.UIElement3D which is abstract, and ContainerUIElement3D and ModelUIElement3D in the System.Windows.Media.Media3D namespace)
  • Developers can now place interactive 2D content onto a 3D object. (new class: System.Windows.Media.Media3D.Viewport2DVisual3D)
• Documents/Annotations
  • The annotations framework now exposes the capabilities for matching annotations with the corresponding annotated objects. (new interface IAnchorInfo and new class TextAnchor in the System.Windows.Annotations namespace)
• Better IME support, RichTextBox extensibility (new property IsDocumentEnabled), performance improvements, and more!