I picked up this booklight from B&N for about $25. Its flat clip actually slides down between the cover and the ebook reader (I have a Sony 650) and the 6 LEDs put a clear bright glare-free light on the whole screen for easy reading even in a completely dark room. I'm not crazy about the clamp - it is shaped in such a way that if you do use it clamped on any book, including an eReader, the back side sticks out - but since I'm not clamping it, that is no problem. I just leave the clip closed and slide it down behind my reader. AND it is rechargeable - which makes it very lightweight and very sensible. A review can be seen here, which also shows the recharging base - it recharges through a USB port.
http://www.kaboodle.com/reviews/prot...mart-booklight
Disclaimer: I have no association with B&N or with Protocol - just think it is a handy gadget that might interest others.
Pics - first on left shows the reader from the back, with the light inserted. Second from the front, and then a couple to try to show it in use - those are hard pictures to take! It looks more glarey and uneven in the camera than it does in person.
Glare may depend on the screen of the eReader you have so YMMV.
