After having a good read of the Family.Show reference application I've been blown away with the power of data binding. I think that with all the hype over how easy it is to now create fancy UI's, WPF may be overlooked for general business development, when in fact its perfect for your average business process application. Of course that's not to say that these applications couldn't use an interaction specialist to help improve the users productivity, until business catch on that WPF has a slightly different development model (one with more focus on usability) it might be hard to justify the extra cost initially.
I've also just read Paul Stovell's data binding example based on winforms technology, it's not be as widely written about, but it seems that some pretty powerful data binding features exist in winforms today, it's just a matter of getting into the mind set. Its pretty cool how WPF databinding is introducing some new concepts to old technology.