Submitted by BWJones
I've been very happy with the Pentagon LED lights. While they run on 123A batteries, they seem to last forever and the output is exceptional. They are ruggedly built, will not roll around on flat or curved objects and are reasonably priced.
ED -- This was in response to my quest for a better flashlight. There were a number of helpful suggestions offered up which are all deserving of their own entries so I'll be breaking them out and putting them up shortly.