Maglites. All the others are imitators. But I have taken a fancy to all of the LED lights on the market these days.
I just started carrying an minimag for geocaching. It's small, uses the same batteries as my GPSr and it's a great light. Always has been. You can put a red lense on it if you need to, it's water resistant, it's rugged, it comes with a spare bulb, you can even use it as a candle if needed. It's just a classicly well designed product.