ESRI and ERM Diagram
We found out today that ESRI (www.esri.com) have released ArcGIS Diagrammer 9.0 which uses ERM Diagram 4.1 to visualize their Xml Workspace document.
You can read further at the following links:
http://www.spatiallyadjusted.com/2007/07/23/arcgis-diagrammer-92-beta/
http://www.arcorama.fr/2007/07/welcome-to-arcgis-diagrammer.html