Remove Duplicate Nodes based on title

Based on code from Robert Douglass.
I have added few lines to make it copy-paste-able to a module.
Simply copy this to dedupe.module, and create module named "dedupe". More info about creating modules can be found here.

<?php/**
* @file
* Remove Duplicate Nodes.
*/

/**
* Implementation of hook_menu().
*/function dedupe_menu() {
    $items['admin/content/dedupe'] = array(
        'title' => 'Dedupe',
        'description' => 'Delete Duplicate Nodes',
        'page callback' => 'drupal_get_form',
        'page arguments' => array('dedupe_content_command'),
        'access arguments' => array('administer site configuration'),
        'type' => MENU_NORMAL_ITEM,
    );
    return $items;
}/**
* Build Form
*/function dedupe_content_command() {
    $options = node_get_types('names');
    $form['dedupe_node_types'] = array(
        '#type' => 'select',
        '#title' => t('You can select content type from which duplicates are removed.'),
        '#options' => $options,
        '#default_value' => variable_get('dedupe_node_types', array('page')),
        '#description' => t('Duplicate content from the selected content types will be deleted.'),
    );
    $form['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Dedupe'),
    );
    return $form;
}/**
* Call delete function and set message.
*/function dedupe_content_command_submit($form, $form_state) {
    $type= $form_state['values']['dedupe_node_types'];
    $dedupe_m = 'Duplicates deleted from content type '. $type;
    dedupe_delete($type);
    drupal_set_message(check_plain(t($dedupe_m)));
}/**
* Delete duplicates from selected content type, based on title. By Robert Douglass.
* @see <a href="http://robshouse.net/blog-post/remove-duplicate-nodes-dedupe-based-title
" title="http://robshouse.net/blog-post/remove-duplicate-nodes-dedupe-based-title
" rel="nofollow">http://robshouse.net/blog-post/remove-duplicate-nodes-dedupe-based-title
</a> */function dedupe_delete($type) {
    $previous = array();
    $result = db_query("SELECT nid, title FROM {node}
    WHERE title IN
      (SELECT title FROM {node}
        WHERE type = '%s'
        GROUP BY title HAVING count(*) > 1)
    ORDER BY title, created DESC", $type);
    while ($row = db_fetch_array($result)) {
        if ($row['title'] == $previous['title']) {
            node_delete($previous['nid']);
        }
        $previous = $row;
    }
}?>