With a bigger WPF user base it should mean that designers everywhere can help keep the user experience bar high and deliver some cool RIAs and start leveraging 3D more.

Use Inversion of Control to decouple views and viewmodels in WPF.

In the WPF+Prism+Unity world (or Silverlight+Prism+Unity), an application begins with the Shell, which includes the user interface (a WPF window). That window displays one or more WPF User Controls.