--- nodeblock.module
+++ nodeblock.module
@@ -6,6 +6,25 @@
  */
 
 /**
+ * Implementation of hook_menu().
+ */
+function nodeblock_menu() {
+  $items = array();
+
+  if (module_exists('content')) {
+    $items['admin/settings/nodeblock'] = array(
+      'title' => 'Nodeblock',
+      'description' => 'Enable regions for CCK build modes.',
+      'page callback' => 'drupal_get_form',
+      'page arguments' => array('nodeblock_cck_settings_form'),
+      'access arguments' => array('administer content types'),
+    );
+  }
+
+  return $items;
+}
+
+/**
  * Utility function to tell whether a type is enabled as a node block
  */
 function nodeblock_type_enabled($type) {
@@ -116,12 +135,23 @@ function nodeblock_block($op = 'list', $delta = 0, $edit = array()) {
     variable_set('nodeblock_block_' . $delta, array('teaser' => $edit['teaser'], 'links' => $edit['links']));
   }
   elseif ($op == 'view') {
+    global $theme_key;
     $node = node_load($delta);
     if (!node_access('view', $node)) {
       return;
     }
     $nodeblock_display = variable_get('nodeblock_block_' . $delta, array('teaser' => 0, 'links' => 1));
 
+    // If CCK is enabled, set the build mode to the region.
+    $settings = variable_get('nodeblock_regions', array());
+    if (module_exists('content')) {
+      $node->build_mode = 'block';
+      $region = _nodeblock_block_region($delta);
+      if (isset($settings[$theme_key]) && $settings[$theme_key][$region]) {
+        $node->build_mode = $theme_key .'_'. $region;
+      }
+    }
+
     // if the node type is translatable, try to load the node with the appropriate
     // language from the translation set.
     if (module_exists('translation') && translation_supported_type($node->type)) {
@@ -207,3 +237,114 @@ function nodeblock_preprocess_node(&$variables) {
 function nodeblock_theme_registry_alter(&$registry) {
   array_unshift($registry['node']['theme paths'], drupal_get_path('module', 'nodeblock'));
 }
+
+/**
+ * Region settings form.
+ */
+function nodeblock_cck_settings_form() {
+  $form = array();
+
+  drupal_clear_css_cache();
+  $themes = system_theme_data();
+  $settings = variable_get('nodeblock_regions', array());
+
+  module_load_include('inc', 'system', 'system.admin');
+  uasort($themes, 'system_sort_modules_by_info_name');
+
+  $form['nodeblock_regions'] = array(
+    '#type' => 'fieldset',
+    '#title' => t('CCK Regions'),
+    '#description' => t('Please select which regions should be available as build modes for CCK.'),
+    '#tree' => TRUE,
+  );
+
+  foreach($themes as $theme) {
+    if ($theme->status) {
+      $form['nodeblock_regions'][$theme->name] = array(
+        '#type' => 'fieldset',
+        '#title' => $theme->info['name'],
+        '#tree' => TRUE,
+        '#collapsible' => TRUE,
+      );
+  
+      foreach (system_region_list($theme->name) as $region => $title) {
+        $form['nodeblock_regions'][$theme->name][$region] = array(
+          '#type' => 'checkbox',
+          '#title' => $title,
+          '#default_value' => $settings[$theme->name][$region],
+        );
+      }
+    }
+  }
+
+  $form = system_settings_form($form);
+  $form['#submit'][] = 'nodeblock_cck_settings_form_submit';
+
+  return $form;
+}
+
+/**
+ * Submit handler for the nodeblock_cck_settings_form.
+ */
+function nodeblock_cck_settings_form_submit($form, &$form_state) {
+  menu_cache_clear_all();
+}
+
+/**
+ * Implementations of hook_content_build_modes
+ * on behalf of core modules.
+ *
+ * @see node_content_build_modes() in content.module
+ *
+ * @return
+ * An array describing the build modes used by the module.
+ * They are grouped by secondary tabs on CCK's 'Display fields' screens.
+ */
+function nodeblock_content_build_modes() {
+  $settings = variable_get('nodeblock_regions', array());
+
+  if (!empty($settings)) {
+    $build_modes = array();
+
+    foreach($settings as $theme_key => $regions) {
+      foreach (system_region_list($theme_key) as $region => $title) {
+        if ($settings[$theme_key][$region]) {
+          // Delimit the build mode with an underscore like so: themekey_region
+          $build_mode = $theme_key .'_'. $region;
+          // Create the title for the tab.
+          $tab_title = t('@title (@theme)', array('@title' => $title, '@theme' => $theme_key));
+          // Set the build mode, leaving views_style as FALSE for now.
+          $build_modes[$build_mode] = array('title' => $tab_title, 'views_style' => FALSE);
+        }
+      }
+    }
+
+    $build_modes['block'] = array('title' => 'Block', 'views_style' => FALSE);
+
+    if (!empty($build_modes)) {
+      return array(
+        'nodeblock' => array(
+          'title' => t('Block'),
+          'build modes' => $build_modes,
+        ),
+      );
+    }
+  }
+}
+
+/**
+ * Returns the region the block is being viewed in.
+ *
+ * @param $delta
+ *   The $delta (or) $nid of the block
+ *
+ * @return
+ *   The region for the block.
+ */
+function _nodeblock_block_region($delta) {
+  global $theme_key;
+
+  return db_result(db_query("SELECT region FROM {blocks} WHERE module = 'nodeblock' AND delta = '%s' AND theme ='%s'", $delta, $theme_key));
+}
+
+