Today I have found very good tutorials for Expression Blend from http://www.movielibrary.lynda.com. These tutorials covers the topics like
Overview and Installation, The Workspace, Managing Your Projects, Drawing in Blend, Appearance, Working with Text, Using 3D, Media Integration, Layout Controls, Media Integration, Layout Controls, Transformations, Animation and Interactivity, WPF Controls, Working with Data, Application Deployment, Please find following Expression Blend tutorial pages
Expression Blend
Getting Started with Expression Blend 3.75 hours

Expression Blend Beta Preview 2.5 hours

Expression Design
Getting Started with Expression Design

Hope these tutorials are useful. Suggest the some more best tutorials on this topic in bellow comment section.