Front lights, I set them to be in flashing mode only when in a street with lots of light (streelights, store fronts, signs), I can see well, I am pretty visible, but want to attract extra attention. I use solid mode most of the time.
Rear red LED flasher, I always have flashing to save battery and I think flashing is readily identifiable as a bike. Rear flasher is not bright enough to bother anybody, IMO.