There are many techniques I can think off off the top of my head:

• Spear: where you take two hands on a longish flashlight and ram one end (preferably the narrower one) into the attacker.
• Club: Use as a bat, mace, baton or similar swinging weapon where significant acceleration at the end of the flashlight impacts.
• Fist "enhancer": much like a roll of coins, steel bar, or other heavy weighted object, a smaller flashlight is held in the grasped fist and the knuckles are used as the attack surface.
• Hammer: Meant differently than "club" above. Hold flashlight in hand. Use the butt end as the strike surface with a swinging motion. Useful for smaller flashlights or tight spaces. Can be used vertically or semi-horizontally (striking inward from the side).
• Push: Grasp long light on either end, use the middle to push/block attack. Can also be used to strike either with center or with "enhanced" fist as above. Also excellent for locks/takedowns
• Thrown: Best if it's heavy and metal. Last ditch as a distraction for removal of your body from the area (RUN!).
• Blind: Temporarily blind by flashing attacker directly in their eyes.

There are probably a few more. Solar Plexus, head, neck, throat, and chest are all fairly lethal points of attack. Knee caps, groins, arms, fingers, may not be lethal, but can certainly save your bacon. In a fight, for me it would depend on how threatened I felt. If my attacker came up on me in the dark, he's getting whatever I can give. If it's some idiot trying to start a fight, maybe he gets away with a broken bone or two. But if it's a real life or death situation, I'm attacking any target of convenience.

The British perspective... phew, that's a whole other thread and I don't think it belongs in this forum... and Chris might just start locking it down as I'm pretty sure it's going to raise some anger over very polarizing issues. Note the use of the z. Yes, I'm from the U.S. I didn't spell it polarising. <img src="/images/graemlins/wink.gif" alt="" />