I always like to have a good map light handy, and I really like this one: (No affiliation, blah, blah, blah.)
Aqua Signal LED Chart Light with switch for Red or White Light (12 V)
http://www.amazon.com/Aqua-Signal-Chart ... B0038JJ1O6
It has a 12" flexible arm, both white and red LED for night vision, low power consumption and can be mounted vertically, horizontally, or in-between. I really like the red light because I can leave it on while I am driving (or parked) if I want to see around the immediate area. It is still pretty new, and the gooseneck part is holding up so far.