I've updated the sample applications with all new XAML -- they are now a bit more "Metroid". Here's a comparison between the old and new sample for my talk on Interfaces:
Old Repository Interface Sample
New Repository Interface Sample
The UI re-design does not affect the code that drives the applications; one of the great things about XAML is that you can update the UI to look however you like and still keep the underlying functionality. The updated code can be downloaded from my demos page: http://www.jeremybytes.com/Demos.aspx.
In a future article, I will cover the custom templates (control templates and data templates) that I used to create the updated look.
Even if you don't attend one of my sessions at Code Camp, be sure to stop by to say "Hi" sometime during the weekend. One of my goals at Code Camp is to talk to as many developers as possible -- both old friends and new friends. See you there!