Here is a book light made with Star Wars geeks in mind. The Star Wars Millennium Falcon Book Light has 3 white LEDs to help you get some reading done at night. It clips to stacks of pages 3/4″ thick. It comes with an automatic timer that shuts off after 30 minutes to conserve battery.
This is an officially licensed light. You can use it with your e-book readers too. ThinkGeek is selling these for as low as $7.99 at this time.