- The LED Museum, and most especially its The Punishment Zone have lots of useful information on LED-based flashlights. Nothing specific to a bike headlight, but I've decided that's because nobody is making such a beast.
- The PAL OneStar LED Flashlights sounded tempting enough that I bought one. It's useful as a being seen, but not for actual seeing on a bike. The useful range seems to be about 7 metres. The PAL OneStar review says it's pretty good. Huh. It's also very purplish-blue. I wonder if maybe I got a bad one.
- The CC Expedition review led me to order a CC Expedition - 7 White LED Flashlight. If it's as bright as they say (which I'm starting to doubt, but we'll see), I can almost certainly adapt the head (bulb) from it to make a good driving light. And if you don't want the whole body, you can get just the bulb for about $35.
- The Bicycle Lighting - White LED Light page tells you how to build your own. And their Bicycle Lighting - Driving Lights page has a number of useful links.
- The Action Electronics LightWave 2000 looked promising.
- The HDD Systems Action Light has the drawback of requiring special (expensive, non-rechargable) batteries. Other than that, it looks like an option.