Two things I always try to have on me at all times is a good blade and a good light, well SOG Specialty Knives and Tools put both of those together with their Bladelight Folder LED Knife Flashlight. It features 6 LEDs molded into the handle as well as a 3.9inch steel folding blade. The black handle is made out of glass-reinforced nylon with a no-slip grip. The light is powered by two AAA batteries and puts out 37 lumens of light and is water resistant up to 1 meter up to 30 minutes. It also comes with a limited lifetime warranty.
They currently go for $49 with free shipping at Amazon.com.