FYI, Your xbox 360 does not need to be on to charge your controllers. All you have to do is plug the controllers into the xbox360 meanwhile its on and once you turn it off it continues to charge the controllers until they are fully charged.
My friend actually used his xbox 360 to charge his iPod touch and now it's stuck at the charging screen. Everything has been unplugged and it's just frozen. Any advice on how I would be able to help him out?