For version 1.2 GoSilverlight for Silverlight 4 has four new shape classes: LinkShape, NodeShape, SelectionHandle, and ToolHandle.
These are just like the same-named shape classes in GoWPF. For those of you who are targeting both WPF and Silverlight, this helps reduce the number of XAML differences. It also might allow for easier styling.
However, in GoSilverlight the NodeShape element must be a child of a NodePanel element. In GoWPF a NodeShape element is commonly a child of a NodePanel, but it need not be.