I was checking out Joe Marini latest bit of crunchy goodness on “Interactivity in XAML - Hold the Script, Please” and it's very nice.However I noticed that when I tossed the code into Chris Anderson's XAML Pad app, I kept getting namespace errors. If you get this just switch the namespace used in Joe's samples from http://schemas.microsoft.com/winfx/avalon/2005 to http://schemas.microsoft.com/2003/xaml and all should be well.
Sean