Akash Kava talks about LOB Business Form Layout for both WPF and Silverlight and has posted a presentation on the subject.
There is lot of buzz about LOB Business Form Layout for new platforms WPF & Silverlight, both capable of displaying rich content and extend functionalities of existing components so better then ever before.
XAML is better then earlier Rapid Form designers where you need to drag and drop within an IDE and the layout management becomes so complicated because no IDE is perfect. I remember upgrading from Visual Studio 2005 to 2008 and now 2010, most of our ASP.NET and WinForm projects would require lot of effort to work seamlessly in newer versions. The worst of all is, modifying layout without IDE becomes way to difficult.