I only have one light up front that I usually keep on blink in the city and only switch to solid light on the darker back road on my ride.

In back I have a big bright red blinky/solid light that I will usually keep on blink mode and a small dinky red light that came with my saddle that I usually keep on solid.

I also have a day-glo yellow construction vest with white and orange relfective strips that I put over my backpack at night. I think that's what saves me the most. Those little lights make you visible but are also small and hard to judge distance/location sometimes. Having my whole backpack glow yellow though makes me feel pretty damn confident that I'm going to be seen.

For christmas I might get those little blinking lights that attach to the axles and are generated from the magnets on the spokes just for the hell of being extra visible now that its going to be winter and **** road conditions.