Nice, responsive UI - I like it. After playing with Blend, it's easier to step into.<p>A few things/features to think about for the the future:
- Group selecting / grouping
- Upgrade to silverlight 4 and make use of right-clicks
- The tool tips are helpful, but a little wordy.
- Saving as XAML would be nice
- Having more than two colors in a gradient would be nice<p>I'm anxious to see more. Do you have any sites built with these components?