Now that a BART strike is "imminent" Monday morning, here are your alternate routes around the Bay Area:
Caltrain: Take the train. You can even bring your bike.
Charter Bus Service: According to BART, "We’ve secured 58 buses which have the capabilities to only serve between 2,000 to 4,000 passengers in each direction, depending upon traffic. The service will provide free but very limited commute direction weekday round trip charter bus service at the following four stations: El Cerrito del Norte, Walnut Creek, Dublin/ Pleasanton, and Fremont. The buses will operate 5am-9am and then 3pm-7pm. ... Boarding for afternoon return trips to the East Bay will begin at 3:00pm on Howard Street between Fremont Street and Beale Street. To guarantee yourself a bus ride home, you must be at the bus loading area no later than 7:00pm."
Cycling: SF Bike Coalition has the best routes for getting to and from work.
Ferries: Take a ride on the Bay via one of our fine ferries.
Golden Gate Transit: You can bring bikes on all ferries and 40-foot long buses, provided there's room.
Park & Ride: take advantage of free parking at any BART station or Park & Ride lot to meet your carpool, adjust your work hours.
Telecommute: Just like bloggers. Live the dream.
Also, here's a helpful map of Caltrans, VTA, Muni, Ferries, and more.
Previously: BART Strike Very, Very Possible Monday Morning