I've found the ritelite LPL904 to make a perfect white book light for the Pocket Pro. Amazon has them for $15.
http://www.amazon.com/Rite-Lite-LPL9...3842537&sr=8-1
It uses 3 AAA batteries and 4 LED lights. It's about the same width as the Pocket Pro, clips easily to the standard PPro cover and gives 2-stages of white light that clearly lights the entire page.