You can make your application scale using the Silverlight Toolkit ViewBox, or you can do this using layout controls such as Grid, StackPanel, and WrapPanel. Make your main UserControl Auto width and height (or completely remove the width and height), and the application will resize to the parent div (the default HTML template uses 100% x100%). Then just resize the browser accordingly. IE8 has developer tools that can help you see how your application has changed to specific screen resolutions.
Testing at different screen resolutions is always a good idea.
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