It's been awhile since we last told you that nothing had happened in the negotiations between the Screen Actors Guild and the studios. And now we're back to tell you that something is about to happen. We think. On Sunday, the actors union took two major steps forward in the process toward resolution (we hope) or a strike (we fear). First, the SAG board voted to have a federal mediator brought in to try to revive negotiations that stalled in June. SAG's board also has authorized a vote by all members on whether to strike if the mediation doesn't work.