MSDN's Channel 9 also has some great resources in the form of a WPF Wiki that points you to samples, blogs, tutorials, etc. to get you more productive using WPF.
Home page on Channel 9 for WPF
http://channel9.msdn.com/wiki/default.aspx/WPF.HomePage
Learning WPF Resources (Includes Expression Blend links)
http://channel9.msdn.com/wiki/default.aspx/WPF.LearningWPF