hey, i own a 3rd gen ipod touch. i am looking to buy an ac charger for it. but i read that apple had changed the charging requirements. i tried to use a usb to ac adapter and it doesnt charge my ipod. i looked on amazon, play.com, ebay and im not usre which will work with the new generation ipods. some chargers will give you a 'charger is not compatible' or something like that. which would support it?