I'm currently studying for the Visio exam 70-545. It will be interesting to see where this "Visio to Silverlight" conversion tool leads us.
This opens up a whole new world for Silverlight and WPF developers.
Think of the possibilities of converting network diagrams/flow charts/etc to add to Silverlight and WPF apps.
It'll be nice to avoid the old “convert to EPS, load in Illustrator, then export to XAML“ workflow.