Just a thought. It seems that most of the ear attached light gadgets use more expensive button batteries which last only 16 hours or so. Or the ones that take AA batteries would seem to be rather heavy and some folks complain of the discomfort. And the sony M-case is for the 6 inch Touch edition costing all together about $60 for the case and the light.
I saw this item in Amazon. Not as cute, but probably more practical.
http://www.amazon.com/exec/obidos/tg...ROQWZ&v=glance
(Beam and Read light- 3 LED)
Has anyone tried this? It uses AA batteries and lasts 120 hours.