one problem though. i checked the Apple us store and the cables available there mention that only the 2010 and later models of apple macbook support audio out through these cables. if this is the case, i really have no use for this cable
of course the macbook is running lion today. they specifically mention the macbook 2010 and later edition. so i am assuming that it is a hardware limitations on the older models. i would have to check on Apple related forums.