Those that I've discussed WPF with over the years will know that I think that Microsoft really struggles to demonstrate *business* value for WPF. I've attended many sessions where I've been shown things like the ability to show a video in the taskbar while you flip the taskbar around the screen :-(
Congratulations to Billy Hollis for his WPF business application presentation done on Carl Franklin's DNR TV recently. If you've been wondering how WPF might add value to a business application, watch the first 24 minutes or so of this show:
http://perseus.franklins.net/dnrtvplayer/player.aspx?ShowNum=0115