As a night time commuter, one of the things I have found to work rather well is very light tinted pair of sunglasses. Sounds absolutely crazy, but it seems to reduce the glare from oncoming traffic, especially newer cars with HID's. Vision is barely affected by this and it makes my rides much more enjoyable. Tried clear lenses just for the eye protection but the scattered light was messing with my vision and it seemed to blur everything.

I have tried the multiple light thing and for me it just doesn't work too well. There is not that much traffic when I commute to home (nearly midnight) so it is a bit of overkill. Tried the Niterider Lumina 700 mounted on the helmet and I felt like I could only look straight forward because I was depending on that light too much. Tried it with a 350 instead and the 700 on the bar, same thing. Wasn't checking my surroundings as much and it became a bit of a hazard for me. So now I am just using a Cygolite Dash 460 on the bar.