2-in-1 Car Cigarette Lighter LED
This LED light is small enough to sit in your car’s cigarette lighter, charging off the electrical system to provide a soft blue glowing light.
Pull the Auto LED ($25 at ThinkGeek) out, give it a twist, and you now have a handy flashlight with a super-bright highly focused white spotlight.
The Auto LED fits in most cars, and comes with an adapter.
Update: Sold out at ThinkGeek, but available for $16.25 at Amazon.com.