LiveModel 2.2 - currently in development - includes the option to draw text labels on nodes both horizontally and vertically.  The vertical option is most effective for objects that are used as 'lane heads' in swimlane-like diagrams.  The cross-functional flow diagram is a particular favouriate that has roles as the lane heads.  Here's an example of the vertical text orientation in action:

By default text labels are drawn horizontally.  To change the orientation edit the OBJECT_TYPE.XML meta model configuration file and add 'VerticalText="true"' to the object type specification.  Here's what my Role object type look like:

 <OBJECT_TYPE Id="112" OpenIcon="Role.gif" ClosedIcon="Role.gif" Class="-101" Shape="Rectangle" Color="#b0d8b0" CanCreateVariant="true" Width="200" Height="150" VerticalText="true">
<!-- ... -->
</OBJECT_TYPE>