Tsitsi Gora, in the video below demonstrates the new Silverlight themes and explains the scenarios they had in mind when they created the themes. The new themes include: Jet Pack, Cosmopolitan, Windows 7, and AccentColor. She also takes a deep look at the cosmopolitan theme and shows how you can customize it, if need be. Tsitsi wraps up by demo'ng some tips you can use to maintain design consistency in your app, including how to apply a simple behavior to your TextBox and content presenters. Tsitsi drops a ton of great design tips throughout this episode—you don't want to miss it.