Thanks. I missed the April 2008 CTP, great! I love what you have done with the agile work items - hierarchy items, user stories and test cases - great stuff.
I'm looking forward to seeing the WPF test feedback tool that is mentioned in the video, to have the testers record a video of the bug is good stuff, it will definitely reduce the correspondence of some bugs.
Actually, I have read the published specifications on Rosario and I like the way that you keep everything in the same document. All the way from the requirements down to the actual implementation of every feature - in my team at work we have done the same in our documentation and the users love it.