Never touch the front brake while the wheels aren't dead straight, even at walking speed.
Going fast not only limits your reaction times to danger, it also limits others reaction times to you . You may feel that you are not going dangerously fast - ie you will be able to stop before any perceived danger, but are you prepared to bet your life that the next guy you overtake is as clued up, alert and sober as you are? Unless the road is deserted, you must factor into your "speed appropriate to the conditions" calculations, other road users, not just whether its been raining or not.
Don't think about how good you're looking - even if you are Brad Pitt on a Bonnie! If you're not concentrating on riding, you really improve your chances of crashing.
Exercise extreme caution when pulling up in front of cinema queues, biker gatherings, dealerships, office colleagues. This is always when you will forget to put the kickstand down or something.
