Considering that the Hurt Report indicated that lack of visibility was a major contributor to M/C accidents, I have always been very interested in augmenting the lighting on my bike. I use a headlight modulator for the front. I have had good experience with units from both
www.kriss.com and
www.kisantech.com. These companies also make a variety of other products that will enable you to enhance your rear lighting as well.
www.hyperlites.com has an excellent kit that adds two small led arrays to the rear of the bike. They are running lights until the brakes are applied, then they start to flash. Adding lights to the front is pretty easy too. motolight.com has some great driving lights for the front. You can also get a set of driving lights from an auto parts store for about $20. However, you have to be able to figure out the wiring and mounting on your own, which can be tricky.
Also some bikes have a dual element bulb in the rear turn signals. You can run a wire from your tail light to the unused, spare filament and make rear running lights.
I really notice the difference when I ride. People see me better. Some flash me to let me know my lights are "messed up," when the modulator is running, but I figure, what the hell, at least they saw me.
Francis