If you're starting your development with Windows Presentation Foundation, head over to windowsclient.net, as they're running a great video tutorial series on WPF app development.
Another exhaustive tutorials on designing WPF applications with Expression Blend can be found on the Expression Blend and Design Blog.
And while visiting windowsclient.net, you might as well check out recently released Syndicated Client Experiences Starter Kit & Reader SDK. Remember New York Times Reader? With the SCE starter kit you can build similar experience for delivering your own content to the reader. I have a pretty fixed idea for using this, all I have to do now is find some extra time to pursue it. Anyway, another useful implementation of the SDK is the MSDN Magazine Reader, which also comes with the full source code.