I always have the same problem when using select forms, and I always forget the solution. Instead of returning an array, like: return $competitions; you have to return a drupal_map_assoc, like this: return drupal_map_assoc($competitions); Otherwise, when selecting the form in hook_submit you will get a number, instead of a human readable string.

gistfile1.txt

/**
 * Competition list
 *
 */
function mymodule_competitions_results_list_competitions(){

  // Main sql
  $sql = "SELECT * FROM `node` WHERE type='webform' LIMIT 0,30 ";

  $result = db_query($sql);

  // WE STORE THEM (FULL NODE) IN AN ARRAY TO BE RETURNED
  while( $row = db_fetch_array( $result ) ) {

    $competitions[] = $row['title'];

  }


  return drupal_map_assoc($competitions);
}