Adds the update task list to the current page.
function update_task_list($active = NULL) {
  // Default list of tasks.
  $tasks = array(
    'requirements' => 'Verify requirements',
    'info' => 'Overview',
    'select' => 'Review updates',
    'run' => 'Run updates',
    'finished' => 'Review log',
  );
  drupal_add_region_content('sidebar_first', theme('task_list', array(
    'items' => $tasks,
    'active' => $active,
  )));
}