USA Gear TabGRAB Reinforced No-Slip Tablet Car Mount
I bought this for a recent road trip.  I used it to hold my Nook Color so my toddler could watch movies while we were driving.  The wings adjusted to fit the Nook perfectly and the mount rotated easily.  The attaching points (where it attaches to the headrest) are well made and fit the headrest posts perfectly.  The mount stayed in place over rough roads and my toddler kicking it.  I would recommend this over some of the other cheaper alternatives.  I purchased one of the cheaper ones which broke as soon as