Read Bea's Blog
I think at some point I mentioned I've moved over to work on Data Binding in WPF.
Binding is a thick, but powerful subject in WPF.
One of the testers on my team is blogging (and she's hiding outside MSDN blogs).
Send her a message asking her to blog more about the fun that is data in WPF. Tell her Kevin said so.
(As soon as I get back from Whistler, I'll update the bag-o-tricks with MapPanel and ColorPicker.)