Here is my contribution to world geekiness.

The front light is a 4" 25watt 12 volt sealed beam halogen outdoor floodlight that I got at Home Depot. The black plastic housing is the one it was intended to be used with. I put a bead of silicone sealant around the bulb to keep it from vibrating. The light is mounted to the bike using a piece of 1"x1/4" aluminum bar that I bent into shape and attached to the front fork. The light is supported with a small piece of 3/4" aluminum angle iron. This pivots up-down on the lights mounting and left-right on the main bracket to allow aiming. I used nylon washers to shim the light mount to fit the aluminum angle iron.

The back has two lights -- a 12v strobe light that I got from Active Electronics, and a regular blinkie light. They are both mounted to a piece of 3/4" aluminum angle that is bolted to the rear rack. The strobe and the headlight are powered by a 12v, 2.2ah sealed lead acid battery that I got from ZBattery.com. I carry the battery in my pannier.

I used this setup all winter and I've been very happy with it. I find cars give me a much wider berth than in daylight. I really like the large front light, as it looks "vehicular." The rear strobe is bright enough to use as a daytime light as well. The blinkie is a backup light and meets the legal requirement for a red taillight.