Jamie Zawinski aka jwz is a well known computer programmer who helped author the original Netscape Navigator web browser and made significant contributions to the open source Mozilla browser and XEmacs (a text editor). These days he runs a night club in San Francisco.
He posted jwz's bicycle wisdom to his blog. His feeling are apparently hurt because some people disagree with his "wisdom", but it's still a worthwhile read. I agree with some of his collected wisdom, and some I disagree with. Big deal.
I've been using a bike as my exclusive transportation in SF for about ten years. I've always ridden, but that's when I stopped driving a car except under extreme duress.
Here's how to begin your adventure as a commuter-bicyclist in San Francisco....