вот, много видео по слингам http://www.youtube.com/results?search_query=%D1%81%D0%BB%D0%B8%D0%BD%D0%B3+%D0%B8%D0%BD%D1%81%D1%82%D1%80%D1%83%D0%BA%D1%86%D0%B8%D0%B8&aq=fhttp://slingomamy.livejournal.com/6206938.html#comments