How would you like to create assets in Graphic Designer and apply them to your WPF applications in Expression Interactive Designer without ever touching a line of XAML? With some new features in the May 2006 CTPs of EGD and EID, you can do this. This screencast
shows you how it can be done. (Note -- the screencast seems to hide the dialog that appears when you apply a resource, but if you are following along w/ EID, it will make sense.)
Another thing you may not realize: you can cut/paste from Adobe Illustrator into EGD, which isn't lossless, but is pretty good.