CKEditor and serverpreview?

Just a little bump cause I'd like to know this as well.

/**
 * File Name: serverpreview\plugin.js
 * 
 * Licensed under the terms of the GNU Lesser General Public License:
 *       http://www.opensource.org/licenses/lgpl-license.php
 * 
 *    Plugin for CKeditor 3 to send the current data to the server so it can be previewed in a custom way
 *   Extended from the FCK plugin with the same name, by Alfonso Martínez de Lizarrondo
 *
 *  version
 *      0.1 15/02/2006
 *      0.2 02/09/2007 Replace the 'Preview' command instead of creating a custom one.
 *      0.3 14/07/2010 No longer replaces the Preview button, adds another one instead.      
 * 
 * File Author:
 *       Vlad Fratila
 *       vlad.fratila@gmail.com
 * 
 * == How to Use: ==
 *
 * Add the plugin in your config.js like other plugins:
 *    config.extraPlugins = 'serverpreview';
 *    
 * You will also need to specify the full URL of your server-side script like this:
 *      config.serverPreviewURL = 'http://www.mydomain.com/myfile.php';
 * In this file, you need to stripslashes and display the post variable "htmlData"
 * 
 * To get an icon for the button, you will need to change your skin's CSS file
 * (e.g. if you're using the default: change /ckeditor/skins/kama/editor.css)
 * I just disabled the Preview plugin and did a Search/Replace to replace 'preview' with 'serverpreview'.
 * 
 *  Lastly, don't forget to add the button 'ServerPreview' to your toolbars!
 *
 */


(function(){
   
   var pluginName = 'serverpreview';

   var serverpreviewCmd =
   {
      modes : { wysiwyg:1, source:1 },
      canUndo : false,
      exec : function( editor )
      {
         var theForm = document.getElementById('serverPreviewForm') ;
         if (!theForm) {
            //it doesn't exist still, we create it here
            theForm = document.createElement('FORM') ;
            theForm.method = 'POST' ;
            theForm.name = 'serverPreviewForm' ;
            theForm.id=theForm.name ;
            theForm.style.display = 'none' ;

            theForm.action = editor.config.serverPreviewURL;

            //new window please
            theForm.target='_blank';
            document.body.appendChild( theForm );
         }

         //clear previous data
         theForm.innerHTML = '' ;
         //set the new content
         var input = document.createElement('INPUT') ;
         input.type = 'hidden';
         //change the name as needed -->
         input.name = 'htmlData' ;
         //set the data
         input.value = editor.getData();
         //append the new input to the form
         theForm.appendChild( input );

         //that's all, append additional fields as needed, or set the variables in the previewPath

         //send the data to the server
         theForm.submit();
      }
   }
   
   
   CKEDITOR.plugins.add( pluginName,
   {
      init : function( editor )
      {
         editor.addCommand( pluginName, serverpreviewCmd );
         editor.ui.addButton( 'ServerPreview',
            {
               label : 'Server Preview',
               command : pluginName
            });
      }
   });
   
})();

Great stuff. You should open it as a new ticket and try to get it added to the core code. I think that having an optionally configurable preview page would be incredibly helpful for some people!