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Kevin Moore (formerly a PM on the WPF team) published a really great set of utilities and demos he called the "WPF Bag of Tricks". Despite my ongoing interest in WPF, I was unaware of where to find this up until recently, and in my own unscientific polling, many of the WPF enthusiasts amongst the ISVs I work with were unaware of it as well.
I'd like to help remedy that.
You can find the WPF Bag of Tricks up on http://j832.com/bagotricks. Therein, you'll find some nice general purpose and specialized samples suitable for reuse in your apps and complete with source code and the right to reuse it, including:
I hope Kevin will continue with this, but regardless, I think you'll benefit greatly from checking out what they make possible for WPF.