I can do this with DI (per Tom Schindl's MailStore 4.0 App), i.e. using an ESelectionService to inject the currently selected book into the view with the text widgets. I also know it is possible with CDO, but this would mean hitting the server each time a selection is made?

Can two views share a single model object?

What do you mean by "hitting the server each time a selection is made"?

Do you mean an E4 part or a CDO view

You don't need a server for this, just one EMF ResourceSet to feed the master view with EObjects. Such a view normally needs read-only access to the model and registers an ISelectionProvider (the JFace viewer) with the part site. The details view can then directly access the EObject selected in the master view and change it.

getSite().setSelectionProvider(tableViewer);

   ISelectionListener listener = new ISelectionListener() {
      public void selectionChanged(IWorkbenchPart part, ISelection sel) {
         if (!(sel instanceof IStructuredSelection))
            return;
         IStructuredSelection ss = (IStructuredSelection) sel;
         Object o = ss.getFirstElement();
         if (o instanceof Book) {
         	updateBook((Book)o);
                System.out.println("Table view selection changed");
         }
      }