I live in a fairly urban setting and there are plenty of cars around when it gets past dark. The main point of having a bicycle light/backlight (I contend) is not for you to see, its for others to see you. Besides just using lights, there are plenty of other reflective Doohickeys that purport to make you visible at night. (see this thread for an example)
In practice this works just fine in relatively suburban or lightly trafficked areas. Where an extra light on the road does stand out and people notice a bike rider. However, I live in a fairly urban area, and down-town is saturated with light that a dincky bike light will not stand out in the crowd.
I've experienced this both from the POV of a driver and of a cyclist. Just today I was driving downtown and almost hit a biker with the notorious right hook. Luckily we didn't make any contact, but afterwards I recognized why I didn't notice him even though he was wearing a reflective vest and had a decently bright light. His light made him blend in more with the backdrop of downtown. The oversaturated lighting of downtown desensitized me to certain visual cues that usually would tip me off to the presence of a biker or a car (i.e. their glaring lights in my mirrors). If I was driving down a darkish residential street I would have noticed him right away.
So what are some good tips on biking at night in urbanized areas, where there are more than just a few cars out after dusk. More specifically, what can you do (that you normally wouldn't do during the day) and besides making yourself brighter that would make your night ride safer?