WYSIWYG on panel panes
The last time I added Panels to a site, I used this code to preload the required libraries on panels edit pages.

  // Panels support.
  if (module_exists('panels') &amp;&amp; $form_id == 'panels_edit_display') {
    // Load potential editor.
    foreach (filter_formats() as $format =&gt; $object) {
      if ($profile = wysiwyg_get_profile($format)) {
        wysiwyg_load_editor($profile);
        wysiwyg_add_plugin_settings($profile);
        wysiwyg_add_editor_settings($profile, 'advanced');
      }
    }
  }


From http://drupal.org/node/356480#comment-1190907 and the patch located in http://drupal.org/node/356480#comment-4256204.

This setup worked with:


Drupal 7.0
Latest WYSIWYG 7.x-2.x-dev from git
CKEditor 3.6
Panels 7.x-3.0-alpha3
CTools 7.x-1.0-alpha4