The nmidWeb2 plugin for the Cacti performance monitoring tool enhances the Tree-View mode with a "Web 2.0" interface. All graphs are rendered within a protlet which can be moved around therefore effectively re-aranging the graph ordering. The position of the portlets is stored within the database on a per-user basis and restored once the specific user re-visits the tree.
Integration with v0.8.8.
Please download the latest version from the project page.