With more than 30,000 members of the United Teachers Los Angeles union off the job since their strike began Monday, teachers from half a dozen public schools in Oakland, Calif., are preparing for their own walkout on Friday. … Meanwhile, teachers in Chicago, Indiana and Virginia are all weighing various actions -- formal strikes, walkouts or other demonstrations -- over what they say is the underfunding of their schools. … In Chicago, teachers are already planning for work stoppages this year.