One of the features that I was glad to see added to Silverlight 1.0 was the Tag attribute which can be used to add any metadata (hidden) text to any visual element.  I have been using it to add hyperlink features to my applications.  Here's how I do it:

1. I put the hyperlink URL in the Tag attribute of an element:
   <TextBlock Width="14.8" Height="14.8" Text="i" TextWrapping="Wrap" FontFamily="Webdings" Foreground="#FF71FF0D" Canvas.Left="135.2" Canvas.Top="85.2" Cursor="Hand" Tag="http://blogs.msdn.com/synergist"/>
2. I then have a JavaScript function AddLinks() that I call when the scene is loaded or when I load additional XAML:
   function AddLinks(visual)
{
    if (visual.Tag != "")
    {
        visual.AddEventListener("MouseLeftButtonDown", ClickPageLink);
        visual.Cursor = "Hand";
    }

    if (visual.toString() == "Canvas")
    {
       for (var i = 0; i < visual.children.count; i++)
       {
           AddLinks(visual.children.getItem(i));
       }
    }
}

function ClickPageLink(sender, eventArgs)
{
    window.open(sender.Tag, "_blank");
}

This lets me add hyperlinks to any visual element in a scene.