Bike light etiquette

"Headlights on when it's dark enough to need them." That's all there is to it, right? Well, there are a few matters of etiquette that rarely get written down or spoken, but I'll try to lay out my version of them here. All the points listed here revolve around not blinding people (pedestrians, other cyclists, cars, etc.) and creating an annoying or even unsafe situation for others. Point your lights towards the ground. Not horizontal, not upwards. This make a big difference in terms of not having the light seems painfully bright for folks you meet head-on. You don't want to point your headlight straight down, but based on your speed you probably want to illuminate the ground as best you can in front of you. Turn off the super-bright flashing headlight when it's dark, especially if there are bikes passing head-on. The super bright flashing light (e.g., the flash mode I have on my Niterider Lumina (Retail: $99, got my 1100 series for $75 on ebay) is...