/**
   * Retrieve comments with author and profile
   *  
   * @todo: table aliases :-)
   * 
   */  
  public function getCommentsWithAuthor($culture = null)
  {
    if($culture === null)
    {
      $culture = sfContext::getInstance()->getUser()->getCulture();
    }
    $query = new Doctrine_Query();
    $comments = $query->from('LocationComment')
                      ->from('LocationComment.author, LocationComment.LocationCommentI18n, LocationComment.author.profile')
                      ->where('LocationComment.LocationCommentI18n.culture = ? AND LocationComment.id = ?', 
                        array($culture, $this->getId()))
                      ->orderBy('LocationComment.created_at desc')  
                      ->execute();
    return $comments;
  }  

// in my template:
    <?php $comments = $location->getCommentsWithAuthor(); ?>

<?php foreach($comments as $comment): ?>
    <?php $author = $comment->getAuthor(); ?>
    <?php 
// this is another query, why?
$profile = $author->getProfile(); 

?>

<?php endforeach; ?>