NiteRider's MiNewt.350 Cordless will guide you safely home. This bright light puts out up to 350 lumens for up to ten hours and weighs in at only 190 grams! Attachment is easy, too, on handlebars up to 31.8mm in diameter or on your helmet. There are four modes to choose from: high, medium, low, and energy-saving walk. Plus, you can charge it off a computer's USB port!
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I use this in combination with a Minewt 650 for commuting during the winter, when it's fully dark. I have the 650 pointing straight ahead and the 350 pointing down at the ground in front of the bike. This combination is as bright as a car headlight, and provides excellent visibility even at high downhill speeds up to 40 mph. I particularly love: USB charging, and the charge indicator built into the top of the light, so you can see it as you ride. I'm getting 2 hours of light from each charge, which is plenty for commuting two days. Oh, yeah: it has an incredibly bright flash mode which works great for day riding. The only problem I've had is a slight tendency for the light to shift angle during rides - oddly, this hasn't happened with the 650, which is on an identical mount. I cured this by wrapping my bar with some textured tape. Otherwise, 5 stars.