From Chris, WPF Photo Print.
The joke at work is often, “Microsoft designed WPF to fit two niches, photos, and RSS readers.”
Not that there’s anything wrong with a photo printer. WPF seems to be good at “media”, less good at line of business applications. Bil discusses this very issue here.
I love DataTemplates in WPF. The rest — ah, isn’t as interesting to me anymore. Unless I needed the media features or DataTemplate feature, I wouldn’t use WPF for a line of business application anymore. I’d do web with a rich client (as needed) or WinForms. The barrier to entry for a large LOB application in WPF is too high for most.

There are numerous examples available which illustrate the power of WPF. Yes, WPF is perhaps not the technology to use if the LOB application does not some fancy eye candy, for complex UIs, WPF is the way to go (imagine fade-in/fade-out transitions in Winforms!).
my two cents.
indyfromoz