Here are a few quick links to help you get started biking in SF!

Cyclepedia – A Reference for Bike Related Things in SF

List of Bicycle Shops and Rentals in San Francisco

Cycle Chic – SF

Bay Area Bike Share

Cyclodeo – San Francisco

SF Bike Route Planner

Butterlap SF

Sunday Streets

SF Bike Party

SF Critical Mass

San Francisco Bicycle Coaltion

SF Market Street Bike Counter – Daily Counts