Explore these websites for library-related job listings:
BAISL - Bay Area Independent School Librarians
BayNet - Click on "Job Links and Listings" link
California Library Association's JobMart
California Academic & Research Libraries-ACRL job listings
Craigslist - search job postings 
EdJoin Job Search California Education job site
Jobs in Library and Information Technology - posted by the LITA division of the American Library Association
JobStar: California - a job search guide
Library Job Postings on the Internet
Northern California and Nevada Medical Library Group Job Resources
Northern California Chapter of COLT jobline
San Andreas/San Francisco Special Library Association jobline
Search for a Job at Special Library Association's Career Connection.
See also the Web Links page of the course website for DVC's L150C Job Search Skills for Library Personnel

Library Job Pages:
Berkeley Public Library
Contra Costa County Library
Oakland Public Library
San Francisco Public Library
San Jose Public Library
Santa Clara City Library
U.C. Berkeley Library

Library Placement Agencies (Bay Area):
Advanced Information Management
Certified Personnel
Taylor & Associates

Job-related articles:
How to apply for a library job - LISWiki