Links
Progressive Jewish Alliance works on marriage equality, labor rights, the death penalty and other social action issues.
Congress of Secular Jewish Organizations represents Secular and Humanistic Jewish communities in the US and Canada.
Workmen's Circle/Arbeter Ring is a sister organization to the CSJO. Its mission is to advance Yiddish culture and social justice. There is a branch based in San Francisco.
Are we too far for you to travel? For a great Sunday School for kids in Berkeley, try East Bay Kindershul. If you're looking for a more congregational setting, try the Humanist congregation, Kol Hadash.
BayJews.org has lots of listings for other Jewish stuff to do in the Bay Area.