I find it pretty pathetic, the lack of good Line of Business examples in the WPF/Silverlight domain with any real graphic design behind it. 99% of the stuff out there on public display looks exactly like I'd expect something to look that was completely done by developers (see: not designers).
The one I see listed that looks great is, of course, using Telerik controls (not cheap AT ALL), so its not really a practical example for a small company or a company who doesn't want to lock themselves into 3rd party solutions.
Billy Hollis' WPF talk is legendary ( http://www.dnrtv.com/default.aspx?showNum=115 ) but there is virtually nothing going into detail on how he did what he did for his client so...yeah.
Discouraging.