I don't begrudge you fighting the ticket, but please learn to stop at stop signs and red lights. I used to work in Cambridge, MA where I had to cross a busy intersection. Cyclists routinely ignored the red light when the walk signal was on, making a dangerous situation for both themselves and the pedestrians. At best, it's just downright rude.

Cambridge started stepping up enforcement against cyclists last fall. I believe the city when they say they're not trying to get money, they're trying to increase safety. If you want car drivers to obey laws against dooring, then cyclists need to obey stop signs and red lights.

I can't speak for SF courts, but the conventional wisdom in MA is to show up, be polite, contrite, and humble. The magistrates are often very forgiving if you show the right attitude. I haven't had to deal with any traffic tickets, but it worked for me for a parking ticket.