Christian Schormann posted a video that demonstrates the new Visual State Manager (aka VSM). The quick and dirty is that the VSM allows you to customize the states of a control. This means you can change the visual presentation of a control for its mouseover state, pressed state, or whatever other states the control might have. Christian’s demo shows this very well.
These features are available in the new Silverlight 2 beta 2 and Blend 2.5 June 2008 Preview bits that will be coming out this week. The more I use Blend the more I see how a graphically challenged developer like me can create very rich interfaces.
This is a great video (and very short), check it out.