In reply to mn:
I have a Petzl Tikka with a single LED spotlight that is fantastic.. though I am aware there are several models... this is mine:
http://www.getoutsideforless.com/product_photos/Petzl_Tikka_XP.jpg
-has submerged buttons to avoid accidental on/off
-if you're doing night nav, it has a boost button to help quick spotlighting
-a moveable lens allows you to focus or create a wave of light quite easily