INOVA micro.  $5 at Academy, Target, close to that anywhere else you find them, and three settings: press/hold ON, "click" ON/OFF(with 2 different brightnesses), and "strobe."  
uses a button battery, but you gotta give somewhere.  
Edited by Erik_B (07/14/10 11:57 AM)
_________________________
Camping teaches us what things we can live without. 
...Shopping appeals to the soul of the hunter-gatherer.