Adds Post Counts by Post Type per User in the User List withing WordPress' Admin console (URL path => /wp-admin/users.php)

wp-post-counts-for-user-by-post-type.php

<?php
/*
  Adds Post Counts by Post Type per User in the User List withing WordPress' Admin console (URL path => /wp-admin/users.php)

  Written for: http://wordpress.stackexchange.com/questions/3233/showing-users-post-counts-by-custom-post-type-in-the-admins-user-list
  By: Mike Schinkel (http://mikeschinkel.com)
  Date: 24 October 2010

*/

add_action('manage_users_columns','yoursite_manage_users_columns');
function yoursite_manage_users_columns($column_headers) {
  unset($column_headers['posts']);
  $column_headers['custom_posts'] = 'Posts';
  return $column_headers;
}

add_action('manage_users_custom_column','yoursite_manage_users_custom_column',10,3);
function yoursite_manage_users_custom_column($custom_column,$column_name,$user_id) {
  if ($column_name=='custom_posts') {
    $counts = _yoursite_get_author_post_type_counts();
    $custom_column = array();
    if (isset($counts[$user_id]) && is_array($counts[$user_id]))
      foreach($counts[$user_id] as $count)
        $custom_column[] = "\t<tr><th>{$count['label']}</th>" .
                             "<td>{$count['count']}</td></tr>";
    $custom_column = implode("\n",$custom_column);
    if (empty($custom_column))
      $custom_column = "<th>No Posts!</th>";
    $custom_column = "<table>\n{$custom_column}\n</table>";
  }
  return $custom_column;
}

function _yoursite_get_author_post_type_counts() {
  static $counts;
  if (!isset($counts)) {
    global $wpdb;
    global $wp_post_types;
    $sql = <<<SQL
SELECT
  post_type,
  post_author,
  COUNT(*) AS post_count
FROM
  {$wpdb->posts}
WHERE 1=1
  AND post_type NOT IN ('revision','nav_menu_item')
  AND post_status IN ('publish','pending')
GROUP BY
  post_type,
  post_author
SQL;
    $posts = $wpdb->get_results($sql);
    foreach($posts as $post) {
      $post_type_object = $wp_post_types[$post_type = $post->post_type];
      if (!empty($post_type_object->label))
        $label = $post_type_object->label;
      else if (!empty($post_type_object->labels->name))
        $label = $post_type_object->labels->name;
      else
        $label = ucfirst(str_replace(array('-','_'),' ',$post_type));
      if (!isset($counts[$post_author = $post->post_author]))
        $counts[$post_author] = array();
      $counts[$post_author][] = array(
        'label' => $label,
        'count' => $post->post_count,
        );
    }
  }
  return $counts;
}

its possible apply at edit.php (manage_posts_columns) ?