From the 'does the guy ever sleep' category, ScottGu enlightens us all again with a very great tutorial on using Expression Blend 2.5 (March preview coming soon) to work with Silverlight 2 content.
Scott walks through a tutorial on using the design-time features of Expression Blend 2.5 and some tips along the way to produce a chat-like application using Silverlight:
Definitely worth a look to study before MIX. Someone might want to pull Scott aside about the font choice though...