I just posted three new hands-on labs for Expression Blend that were created for MIX but haven't been posted for the world yet. There's lots of little nuggets in there worth checking out, things like creating a user controls, databinding, triggers, styling controls, using web services, paging, data input and more. The more I use Blend, the more I love it, but it has its own learning curve, above and beyond WPF.
The first lab is a UI for Windows Live Search, including Image Search.
The second lab is a color swatch lab.
The third lab is a recipe viewer application.