Have you tried out .NET 3.5 SP1... If not, try it now. Its got loads of new features for WPF. In fact rather than a service pack, its more of a new release .. So whats new.. improved deployment, new controls (supports creation of datagrid), improved performance, DirectX integration, HLSL shaders, and many new features. For the complete details, take a look at Tims post Links to the executables: Visual Studio 2008 Service Pack 1 (Beta) .NET Framework 3.5 Service Pack 1 (Beta) Visual Studio 2008 Express Editions SP1 (Beta) Visual Studio 2008 Team Foundation Server 2008 SP1 (Beta) Read More...